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Nasa spacecraft embarks on historic journey into interstellar space.

NASA’s Voyager 1 spacecraft officially is the first human-made object to venture into interstellar space. The 36-year-old probe is about 12 billion miles (19 billion kilometers) from our sun.

New and unexpected data indicate Voyager 1 has been traveling for about one year through plasma, or ionized gas, present in the space between stars. Voyager is in a transitional region immediately outside the solar bubble, where some effects from our sun are still evident. A report on the analysis of this new data, an effort led by Don Gurnett and the plasma wave science team at the University of Iowa, Iowa City, is published in Thursday’s edition of the journal Science.

“Now that we have new, key data, we believe this is mankind’s historic leap into interstellar space,” said Ed Stone, Voyager project scientist based at the California Institute of Technology, Pasadena. “The Voyager team needed time to analyze those observations and make sense of them. But we can now answer the question we’ve all been asking — ‘Are we there yet?’ Yes, we are.”

Voyager 1 first detected the increased pressure of interstellar space on the heliosphere, the bubble of charged particles surrounding the sun that reaches far beyond the outer planets, in 2004. Scientists then ramped up their search for evidence of the spacecraft’s interstellar arrival, knowing the data analysis and interpretation could take months or years.

Voyager 1 does not have a working plasma sensor, so scientists needed a different way to measure the spacecraft’s plasma environment to make a definitive determination of its location. A coronal mass ejection, or a massive burst of solar wind and magnetic fields, that erupted from the sun in March 2012 provided scientists the data they needed. When this unexpected gift from the sun eventually arrived at Voyager 1’s location 13 months later, in April 2013, the plasma around the spacecraft began to vibrate like a violin string. On April 9, Voyager 1’s plasma wave instrument detected the movement. The pitch of the oscillations helped scientists determine the density of the plasma. The particular oscillations meant the spacecraft was bathed in plasma more than 40 times denser than what they had encountered in the outer layer of the heliosphere. Density of this sort is to be expected in interstellar space.

The plasma wave science team reviewed its data and found an earlier, fainter set of oscillations in October and November 2012. Through extrapolation of measured plasma densities from both events, the team determined Voyager 1 first entered interstellar space in August 2012.

“We literally jumped out of our seats when we saw these oscillations in our data — they showed us the spacecraft was in an entirely new region, comparable to what was expected in interstellar space, and totally different than in the solar bubble,” Gurnett said. “Clearly we had passed through the heliopause, which is the long-hypothesized boundary between the solar plasma and the interstellar plasma.”

The new plasma data suggested a timeframe consistent with abrupt, durable changes in the density of energetic particles that were first detected on Aug. 25, 2012. The Voyager team generally accepts this date as the date of interstellar arrival. The charged particle and plasma changes were what would have been expected during a crossing of the heliopause.

“The team’s hard work to build durable spacecraft and carefully manage the Voyager spacecraft’s limited resources paid off in another first for NASA and humanity,” said Suzanne Dodd, Voyager project manager, based at NASA’s Jet Propulsion Laboratory (JPL), Pasadena, Calif. “We expect the fields and particles science instruments on Voyager will continue to send back data through at least 2020. We can’t wait to see what the Voyager instruments show us next about deep space.”

Voyager 1 and its twin, Voyager 2, were launched 16 days apart in 1977. Both spacecraft flew by Jupiter and Saturn. Voyager 2 also flew by Uranus and Neptune. Voyager 2, launched before Voyager 1, is the longest continuously operated spacecraft. It is about 9.5 billion miles (15 billion kilometers) away from our sun.

Voyager mission controllers still talk to or receive data from Voyager 1 and Voyager 2 every day, though the emitted signals are currently very dim, at about 23 watts — the power of a refrigerator light bulb. By the time the signals get to Earth, they are a fraction of a billion-billionth of a watt. Data from Voyager 1’s instruments are transmitted to Earth typically at 160 bits per second, and captured by 34- and 70-meter NASA Deep Space Network (DSN) stations. Traveling at the speed of light, a signal from Voyager 1 takes about 17 hours to travel to Earth. After the data are transmitted to JPL and processed by the science teams, Voyager data are made publicly available.

“Voyager has boldly gone where no probe has gone before, marking one of the most significant technological achievements in the annals of the history of science, and adding a new chapter in human scientific dreams and endeavors,” said John Grunsfeld, NASA’s associate administrator for science in Washington. “Perhaps some future deep space explorers will catch up with Voyager, our first interstellar envoy, and reflect on how this intrepid spacecraft helped enable their journey.”

Scientists do not know when Voyager 1 will reach the undisturbed part of interstellar space where there is no influence from our sun. They also are not certain when Voyager 2 is expected to cross into interstellar space, but they believe it is not very far behind.

JPL built and operates the twin Voyager spacecraft. The Voyagers Interstellar Mission is a part of NASA’s Heliophysics System Observatory, sponsored by the Heliophysics Division of NASA’s Science Mission Directorate in Washington. NASA’s DSN, managed by JPL, is an international network of antennas that supports interplanetary spacecraft missions and radio and radar astronomy observations for the exploration of the solar system and the universe. The network also supports selected Earth-orbiting missions.

The cost of the Voyager 1 and Voyager 2 missions — including launch, mission operations and the spacecraft’s nuclear batteries, which were provided by the Department of Energy — is about $988 million through September.

For a sound file of the oscillations detected by Voyager in interstellar space, animations and other information, visit:

For an image of the radio signal from Voyager 1 on Feb. 21 by the National Radio Astronomy Observatory’s Very Long Baseline Array, which links telescopes from Hawaii to St. Croix, visit:

Protected: Milky Way’s Black Hole Was “Birth Cry” of Radio Astronomy

Dwayne Brown Headquarters, Washington 202-358-1726 [email protected] Jia-Rui C. Cook Jet Propulsion Laboratory, Pasadena, Calif. 818-354-0850 [email protected]

What the Voyager space probes can teach humanity about immortality and legacy as they sail through space for trillions of years

Professor Emeritus and Lecturer in Religion and Science, Florida International University

Disclosure statement

James Edward Huchingson does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

Florida International University provides funding as a member of The Conversation US.

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Voyager 1 is the farthest human-made object from Earth. After sweeping by Jupiter, Saturn, Uranus and Neptune, it is now almost 15 billion miles (24 billion kilometers) from Earth in interstellar space. Both Voyager 1 and its twin, Voyager 2, carry little pieces of humanity in the form of their Golden Records . These messages in a bottle include spoken greetings in 55 languages, sounds and images from nature, an album of recordings and images from numerous cultures, and a written message of welcome from Jimmy Carter, who was U.S. president when the spacecraft left Earth in 1977 .

The Golden Records were built to last a billion years in the environment of space, but in a recent analysis of the paths and perils these explorers may face, astronomers calculated that they could exist for trillions of years without coming remotely close to any stars.

Having spent my career in the field of religion and science , I’ve thought a lot about how spiritual ideas intersect with technological achievements. The incredible longevity of the Voyager spacecraft presents a uniquely tangible entry point into exploring ideas of immortality.

For many people, immortality is the everlasting existence of a soul or spirit that follows death. It can also mean the continuation of one’s legacy in memory and records. With its Golden Record, each Voyager provides such a legacy, but only if it is discovered and appreciated by an alien civilization in the distant future.

Life after death

Religious beliefs about immortality are numerous and diverse. Most religions foresee a postmortem career for a personal soul or spirit, and these range from everlasting residence among the stars to reincarnation.

The ideal eternal life for many Christians and Muslims is to abide forever in God’s presence in heaven or paradise. Judaism’s teachings about what happens after death are less clear. In the Hebrew Bible, the dead are mere “shades” in a darkened place called Sheol. Some rabbinical authorities give credence to the resurrection of the righteous and even to the eternal status of souls.

Immortality is not limited to the individual. It can be collective as well. For many Jews, the final destiny of the nation of Israel or its people is of paramount importance. Many Christians anticipate a future general resurrection of all who have died and the coming of the kingdom of God for the faithful.

Jimmy Carter, whose message and autograph are immortalized in the Golden Records, is a progressive Southern Baptist and a living example of religious hope for immortality. Now battling brain cancer and approaching centenarian status, he has thought about dying. Following his diagnosis, Carter concluded in a sermon : “It didn’t matter to me whether I died or lived. … My Christian faith includes complete confidence in life after death. So I’m going to live again after I die.”

It is plausible to conclude that the potential of an alien witnessing the Golden Record and becoming aware of Carter’s identity billions of years in the future would offer only marginal additional consolation for him. Carter’s knowledge in his ultimate destiny is a measure of his deep faith in the immortality of his soul. In this sense, he likely represents people of numerous faiths.

Secular immortality

For people who are secular or nonreligious there is little solace to be found in an appeal to the continuing existence of a soul or spirit following one’s death. Carl Sagan, who came up with the idea for the Golden Records and led their development, wrote of the afterlife: “ I know of nothing to suggest that it is more than just wishful thinking .” He was more saddened by thoughts of missing important life experiences – like seeing his children grow up – than fearful about the expected annihilation of his conscious self with the death of his brain.

For those like Sagan there are other possible options for immortality. They include freezing and preserving the body for future physical resurrection or uploading one’s consciousness and turning it into a digital form that would long outlast the brain. Neither of these potential paths to physical immortality has proved to be feasible yet.

The Voyagers and legacy

Most people, whether secular or religious, want the actions they do while alive to bear continuing meaning into the future as their fruitful legacy . People want to be remembered and appreciated, even cherished. Sagan summed it up nicely: “To live in the hearts we leave behind is to live forever .”

With Voyagers 1 and 2 estimated to exist for more than a trillion years, they are about as immortal as it gets for human artifacts. Even before the Sun’s expected demise when it runs out of fuel in about 5 billion years, all living species, mountains, seas and forests will have long been obliterated . It will be as if we and all the marvelous and extravagant beauty of planet Earth never existed – a devastating thought to me.

But in the distant future, the two Voyager spacecraft will still be floating in space, awaiting discovery by an advanced alien civilization for whom the messages on the Golden Records were intended. Only those records will likely remain as testimony and legacy of Earth, a kind of objective immortality.

Religious and spiritual people can find solace in the belief that God or an afterlife waits for them after death. For the secular, hoping that someone or something will remember humanity, any wakeful and appreciative aliens will have to do.

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What Is on Voyager’s Golden Record?

From a whale song to a kiss, the time capsule sent into space in 1977 had some interesting contents

Megan Gambino

Senior Editor

“I thought it was a brilliant idea from the beginning,” says Timothy Ferris. Produce a phonograph record containing the sounds and images of humankind and fling it out into the solar system.

By the 1970s, astronomers Carl Sagan and Frank Drake already had some experience with sending messages out into space. They had created two gold-anodized aluminum plaques that were affixed to the Pioneer 10 and Pioneer 11 spacecraft. Linda Salzman Sagan, an artist and Carl’s wife, etched an illustration onto them of a nude man and woman with an indication of the time and location of our civilization.

The “Golden Record” would be an upgrade to Pioneer’s plaques. Mounted on Voyager 1 and Voyager 2, twin probes launched in 1977, the two copies of the record would serve as time capsules and transmit much more information about life on Earth should extraterrestrials find it.

NASA approved the idea. So then it became a question of what should be on the record. What are humanity’s greatest hits? Curating the record’s contents was a gargantuan task, and one that fell to a team including the Sagans, Drake, author Ann Druyan, artist Jon Lomberg and Ferris, an esteemed science writer who was a friend of Sagan’s and a contributing editor to Rolling Stone .

The exercise, says Ferris, involved a considerable number of presuppositions about what aliens want to know about us and how they might interpret our selections. “I found myself increasingly playing the role of extraterrestrial,” recounts Lomberg in Murmurs of Earth , a 1978 book on the making of the record. When considering photographs to include, the panel was careful to try to eliminate those that could be misconstrued. Though war is a reality of human existence, images of it might send an aggressive message when the record was intended as a friendly gesture. The team veered from politics and religion in its efforts to be as inclusive as possible given a limited amount of space.

Over the course of ten months, a solid outline emerged. The Golden Record consists of 115 analog-encoded photographs, greetings in 55 languages, a 12-minute montage of sounds on Earth and 90 minutes of music. As producer of the record, Ferris was involved in each of its sections in some way. But his largest role was in selecting the musical tracks. “There are a thousand worthy pieces of music in the world for every one that is on the record,” says Ferris. I imagine the same could be said for the photographs and snippets of sounds.

The following is a selection of items on the record:

Silhouette of a Male and a Pregnant Female

The team felt it was important to convey information about human anatomy and culled diagrams from the 1978 edition of The World Book Encyclopedia. To explain reproduction, NASA approved a drawing of the human sex organs and images chronicling conception to birth. Photographer Wayne F. Miller’s famous photograph of his son’s birth, featured in Edward Steichen’s 1955 “Family of Man” exhibition, was used to depict childbirth. But as Lomberg notes in Murmurs of Earth , NASA vetoed a nude photograph of “a man and a pregnant woman quite unerotically holding hands.” The Golden Record experts and NASA struck a compromise that was less compromising— silhouettes of the two figures and the fetus positioned within the woman’s womb.

DNA Structure

At the risk of providing extraterrestrials, whose genetic material might well also be stored in DNA, with information they already knew, the experts mapped out DNA’s complex structure in a series of illustrations.

Demonstration of Eating, Licking and Drinking

When producers had trouble locating a specific image in picture libraries maintained by the National Geographic Society, the United Nations, NASA and Sports Illustrated , they composed their own. To show a mouth’s functions, for instance, they staged an odd but informative photograph of a woman licking an ice-cream cone, a man taking a bite out of a sandwich and a man drinking water cascading from a jug.

Olympic Sprinters

Images were selected for the record based not on aesthetics but on the amount of information they conveyed and the clarity with which they did so. It might seem strange, given the constraints on space, that a photograph of Olympic sprinters racing on a track made the cut. But the photograph shows various races of humans, the musculature of the human leg and a form of both competition and entertainment.

Photographs of huts, houses and cityscapes give an overview of the types of buildings seen on Earth. The Taj Mahal was chosen as an example of the more impressive architecture. The majestic mausoleum prevailed over cathedrals, Mayan pyramids and other structures in part because Mughal Emperor Shah Jahan built it in honor of his late wife, Mumtaz Mahal, and not a god.

Golden Gate Bridge

Three-quarters of the record was devoted to music, so visual art was less of a priority. A couple of photographs by the legendary landscape photographer Ansel Adams were selected, however, for the details captured within their frames. One, of the Golden Gate Bridge from nearby Baker Beach, was thought to clearly show how a suspension bridge connected two pieces of land separated by water. The hum of an automobile was included in the record’s sound montage, but the producers were not able to overlay the sounds and images.

A Page from a Book

An excerpt from a book would give extraterrestrials a glimpse of our written language, but deciding on a book and then a single page within that book was a massive task. For inspiration, Lomberg perused rare books, including a first-folio Shakespeare, an elaborate edition of Chaucer from the Renaissance and a centuries-old copy of Euclid’s  Elements  (on geometry), at the Cornell University Library. Ultimately, he took MIT astrophysicist Philip Morrison’s suggestion: a  page  from Sir Isaac Newton’s  System of the World , where the means of launching an object into orbit is described for the very first time.

Greeting from Nick Sagan

To keep with the spirit of the project, says Ferris, the wordings of the 55 greetings were left up to the speakers of the languages. In  Burmese , the message was a simple, “Are you well?” In  Indonesian , it was, “Good night ladies and gentlemen. Goodbye and see you next time.” A woman speaking the Chinese dialect of  Amoy  uttered a welcoming, “Friends of space, how are you all? Have you eaten yet? Come visit us if you have time.” It is interesting to note that the final greeting, in  English , came from then-6-year-old Nick Sagan, son of Carl and Linda Salzman Sagan. He said, “Hello from the children of planet Earth.”

Whale Greeting

Biologist Roger Payne provided a whale song (“the most beautiful whale greeting,” he said, and “the one that should last forever”) captured with hydrophones off the coast of Bermuda in 1970. Thinking that perhaps the whale song might make more sense to aliens than to humans, Ferris wanted to include more than a slice and so mixed some of the song behind the greetings in different languages. “That strikes some people as hilarious, but from a bandwidth standpoint, it worked quite well,” says Ferris. “It doesn’t interfere with the greetings, and if you are interested in the whale song, you can extract it.”

Reportedly, the trickiest sound to record was a  kiss . Some were too quiet, others too loud, and at least one was too disingenuous for the team’s liking. Music producer Jimmy Iovine kissed his arm. In the end, the kiss that landed on the record was actually one that Ferris planted on Ann Druyan’s cheek.

Druyan had the idea to record a person’s brain waves, so that should extraterrestrials millions of years into the future have the technology, they could decode the individual’s thoughts. She was the guinea pig. In an hour-long session hooked to an EEG at New York University Medical Center, Druyan meditated on a series of prepared thoughts. In  Murmurs of Earth , she admits that “a couple of irrepressible facts of my own life” slipped in. She and Carl Sagan had gotten engaged just days before, so a love story may very well be documented in her neurological signs. Compressed into a minute-long segment, the  brain waves  sound, writes Druyan, like a “string of exploding firecrackers.”

Georgian Chorus—“Tchakrulo”

The team discovered a beautiful recording of “Tchakrulo” by Radio Moscow and wanted to include it, particularly since Georgians are often credited with introducing polyphony, or music with two or more independent melodies, to the Western world. But before the team members signed off on the tune, they had the lyrics translated. “It was an old song, and for all we knew could have celebrated bear-baiting,” wrote Ferris in  Murmurs of Earth . Sandro Baratheli, a Georgian speaker from Queens, came to the rescue. The word “tchakrulo” can mean either “bound up” or “hard” and “tough,” and the song’s narrative is about a peasant protest against a landowner.

Chuck Berry’s “Johnny B. Goode”

According to Ferris, Carl Sagan had to warm up to the idea of including Chuck Berry’s 1958 hit “Johnny B. Goode” on the record, but once he did, he defended it against others’ objections. Folklorist Alan Lomax was against it, arguing that rock music was adolescent. “And Carl’s brilliant response was, ‘There are a lot of adolescents on the planet,’” recalls Ferris.

On April 22, 1978,  Saturday Night Live  spoofed the Golden Record in a  skit  called “Next Week in Review.” Host Steve Martin played a psychic named Cocuwa, who predicted that  Time  magazine would reveal, on the following week’s cover, a four-word message from aliens. He held up a mock cover, which read, “Send More Chuck Berry.”

More than four decades later, Ferris has no regrets about what the team did or did not include on the record. “It means a lot to have had your hand in something that is going to last a billion years,” he says. “I recommend it to everybody. It is a healthy way of looking at the world.”

According to the writer, NASA approached him about producing another record but he declined. “I think we did a good job once, and it is better to let someone else take a shot,” he says.

So, what would you put on a record if one were being sent into space today?

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Megan Gambino | | READ MORE

Megan Gambino is a senior web editor for Smithsonian magazine.

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The Reg in Space

Space exploitation vs space exploration: Humanity has much to learn from the Voyager probes

When 'what's the value to the economy' wasn't front of mind.

Interview It will soon be half a century since NASA's Voyager probes were launched on a tour of the solar system. The reason for their unprecedented longevity is unprecedented, but modern realities mean that we might not see their like again.

Dr Garry E Hunt was one of the original imaging team members and tells The Register why he thinks the veteran spacecraft had endured for so long. "Brilliant engineering," he says. "Let's be honest, the scientific community gets credit, but it's the engineers that really deserve the credit."

The twin Voyager spacecraft were launched in 1977. Both were to perform flybys of Jupiter and Saturn, but while Voyager 1 would visit Saturn's Moon, Titan, Voyager 2 could perform a Grand Tour of the planets, taking in Neptune and Uranus. "[Former US President Richard] Nixon," says Hunt, "only funded it as far as Saturn; he refused to have it funded for longer…"

However, both spacecraft were in good health thanks to some canny engineering decisions and plenty of redundant systems. So the Tour continued, with memorable shots of Uranus and Neptune before the famous Pale Blue Dot image was taken.

Over 30 years on, the Solar System family portrait remains Hunt's proudest moment from the mission: "If you ask me what was the most important picture we took? … The picture that showed the entire family of the Solar System from just beyond the orbit of Neptune, which showed that the Earth was a tiny tiny blue dot.

43 years and 14 billion miles later, Voyager 1 still crunching data to reveal secrets of the interstellar medium

"And that was a big wake-up call to everybody to say, 'Hey guys, we've got a serious problem. That's the only place that we've found in the solar system that we can live. That's our home. Don't mess it up'."

Could a project like Voyager happen now? Hunt is not so sure: "We have a problem with politics. The US is having a fundamental problem with funding its missions. The budget has been trimmed by Biden, trimmed further by the Senate, decisions are not being made because the election is coming, the pandemic affected establishments like JPL and others … so all these are factors.

"Furthermore, countries say 'Look, it's not just science you get out of this, what's the value to the economy? … We're not prepared to wait 10 or 20 years for something. We need quick results which are beneficial for the economy.

"So I think we're going to be looking at missions to the very distant parts of our solar system somewhat differently. We are looking at the Moon, Mars, and the asteroids somewhat differently. In the past, we talked about space exploration. I think we're looking at a re-spelling. We're looking at space exploitation now."

• 44-year-old Voyager 2 data sheds light on solar system's magnetic personalities
• NASA Juno probe to produce 'firehose of data' during close flyby of Jupiter moon
• NASA engineers scratch heads as Voyager 1 starts spouting cosmic gibberish
• Half a century ago, NASA's Pioneer 10 visited Jupiter, then just kept going

While acknowledging the benefits, Hunt also worries about a more commercial approach. The load and risk are, in theory, spread, yet the desire for quick returns remains. "If you're making something in the most cost-effective way, the cheapest way, you cut corners."

"I look back at the way space missions were developed in the past; the number of redundant systems we had on Voyager; the number of quality checks to make sure nothing failed.

"Will the commercial sector be having the same approach?"

Hunt notes recent issues with NASA's Artemis program and says, "I wonder whether we would have had some these problems in the old days with NASA working the way it did…"

Hunt, however, does accept the modern need to demonstrate the benefits of space exploration. With other pressures on the economy, "can we really afford to do all these things that go on for 10 – 20 years? So return [on investment] has got to be a parameter that is examined very strongly when making decisions."

Things have, of course, moved on since the era of Voyager, even if the chemical rocket technology used to launch the probes continues to power modern rockets. The UK has demonstrated prowess in developing spacecraft systems, but Hunt says the future lies beyond that niche.

"The future of space," he says, "involves everything from high finance to insurance, to engineering, right the way through the spectrum … are we going to be the leaders?"

Hunt's career has been varied. He worked on the Viking missions to Mars and was involved in payloads on the early Shuttle missions. Today, he advises industry and politicians. He is very concerned about climate change and the environment, which is understandable when considering his background in atmospheric science.

Of the Earth, he says, "We're making a jolly good mess of it."

However, Hunt's enthusiasm for science remains undimmed. He is delighted that Voyager data continues to be used for research. "Some of the latest work on Neptune to actually understand and get the correct colors and such like involves going back to the original Voyager data. Isn't that stunning?"

Having noted the retrospective importance now placed on missions from decades past that demonstrated the potential for manufacturing in space, Hunt still expresses awe at the science being generated by modern spacecraft. "The James Webb [space telescope]," he says, "is just unbelievable … they [the James Webb Space Telescope and Hubble] are just stunning."

The Voyager probes continue to demonstrate the benefit of robot explorers. Modern spacecraft like the James Webb Space Telescope are doing the same. The Reg can but hope that any shift from exploration to exploitation won't sacrifice that.

And Hunt? He's looking forward to one more trip to the US to celebrate Voyager's 50th anniversary. "When Voyager's 50th birthday comes up, I think I'd like to be back in JPL," he tells us.

Will the Voyagers still be running? Perhaps.

At the moment, NASA's best guess is that while science data will cease to be collected after 2025, there is every chance that engineering data could continue to be returned for several more years. Both spacecraft could remain in range of the Deep Space Network through 2036, depending on there being enough power remaining to transmit a signal back to Earth. ®

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Hope returns —

Nasa knows what knocked voyager 1 offline, but it will take a while to fix, "engineers are optimistic they can find a way for the fds to operate normally.".

Stephen Clark - Apr 6, 2024 12:28 am UTC

Engineers have determined why NASA's Voyager 1 probe has been transmitting gibberish for nearly five months, raising hopes of recovering humanity's most distant spacecraft.

Voyager 1, traveling outbound some 15 billion miles (24 billion km) from Earth, started beaming unreadable data down to ground controllers on November 14. For nearly four months, NASA knew Voyager 1 was still alive—it continued to broadcast a steady signal—but could not decipher anything it was saying.

Confirming their hypothesis, engineers at NASA's Jet Propulsion Laboratory (JPL) in California confirmed a small portion of corrupted memory caused the problem. The faulty memory bank is located in Voyager 1's Flight Data System (FDS), one of three computers on the spacecraft. The FDS operates alongside a command-and-control central computer and another device overseeing attitude control and pointing.

The FDS duties include packaging Voyager 1's science and engineering data for relay to Earth through the craft's Telemetry Modulation Unit and radio transmitter. According to NASA, about 3 percent of the FDS memory has been corrupted, preventing the computer from carrying out normal operations.

Optimism growing

Suzanne Dodd, NASA's project manager for the twin Voyager probes, told Ars in February that this was one of the most serious problems the mission has ever faced. That is saying something because Voyager 1 and 2 are NASA's longest-lived spacecraft. They launched 16 days apart in 1977, and after flying by Jupiter and Saturn, Voyager 1 is flying farther from Earth than any spacecraft in history. Voyager 2 is trailing Voyager 1 by about 2.5 billion miles, although the probes are heading out of the Solar System in different directions.

Normally, engineers would try to diagnose a spacecraft malfunction by analyzing data it sent back to Earth. They couldn't do that in this case because Voyager 1 has been transmitting data packages manifesting a repeating pattern of ones and zeros. Still, Voyager 1's ground team identified the FDS as the likely source of the problem.

The Flight Data Subsystem was an innovation in computing when it was developed five decades ago. It was the first computer on a spacecraft to use volatile memory. Most of NASA's missions operate with redundancy, so each Voyager spacecraft launched with two FDS computers. But the backup FDS on Voyager 1 failed in 1982.

Due to the Voyagers' age, engineers had to reference paper documents, memos, and blueprints to help understand the spacecraft's design details. After months of brainstorming and planning, teams at JPL uplinked a command in early March to prompt the spacecraft to send back a readout of the FDS memory.

The command worked, and Voyager1 responded with a signal different from the code it had been transmitting since November. After several weeks of meticulous examination of the new code, engineers pinpointed the location of the bad memory.

"The team suspects that a single chip responsible for storing part of the affected portion of the FDS memory isn’t working," NASA said in an update posted Thursday. "Engineers can’t determine with certainty what caused the issue. Two possibilities are that the chip could have been hit by an energetic particle from space or that it simply may have worn out after 46 years."

Voyager 1's distance from Earth complicates the troubleshooting effort. The one-way travel time for a radio signal to reach Voyager 1 from Earth is about 22.5 hours, meaning it takes roughly 45 hours for engineers on the ground to learn how the spacecraft responded to their commands.

NASA also must use its largest communications antennas to contact Voyager 1. These 230-foot-diameter (70-meter) antennas are in high demand by many other NASA spacecraft , so the Voyager team has to compete with other missions to secure time for troubleshooting. This means it will take time to get Voyager 1 back to normal operations.

"Although it may take weeks or months, engineers are optimistic they can find a way for the FDS to operate normally without the unusable memory hardware, which would enable Voyager 1 to begin returning science and engineering data again," NASA said.

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Channel ars technica.

We finally know why NASA's Voyager 1 spacecraft stopped communicating — scientists are working on a fix

The first spacecraft to explore beyond the solar system started spouting gibberish late last year. Now, NASA knows why.

NASA engineers have discovered the cause of a communications breakdown between Earth and the interstellar explorer Voyager 1. It would appear that a small portion of corrupted memory exists in one of the spacecraft's computers. 

The glitch caused Voyager 1 to send unreadable data back to Earth, and is found in the NASA spacecraft's flight data subsystem (FDS). That's the system responsible for packaging the probe's science and engineering data before the telemetry modulation unit (TMU) and radio transmitter send it back to mission control. 

The source of the issue began to reveal itself when Voyager 1 operators sent the spacecraft a "poke" on March 3, 2024. This was intended to prompt FDS to send a full memory readout back to Earth.

The readout confirmed to the NASA team that about 3% of the FDS memory had been corrupted, and that this was preventing the computer from carrying out its normal operations.

Related: NASA finds clue while solving Voyager 1's communication breakdown case

Launched in 1977, Voyager 1 became the first human-made object to leave the solar system and enter interstellar space in 2012. Voyager 2 followed its spacecraft sibling out of the solar system in 2018, and is still operational and communicating well with  Earth.

After 11 years of interstellar exploration, in Nov. 2023, Voyager 1's binary code — the computer language it uses to communicate with Earth — stopped making sense. Its 0's and 1's didn't mean anything anymore.

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"Effectively, the call between the spacecraft and the Earth was still connected, but Voyager's 'voice' was replaced with a monotonous dial tone," Voyager 1's engineering team previously  told Space.com .

The team strongly suspects this glitch is the result of a single chip that's responsible for storing part of the affected portion of the FDS memory ceasing to work.

Currently, however, NASA can’t say for sure what exactly caused that particular issue. The chip could have been struck by a high-speed energetic particle from space or, after 46 years serving Voyager 1, it may simply have worn out.

—  Voyager 2: An iconic spacecraft that's still exploring 45 years on

—  NASA's interstellar Voyager probes get software updates beamed from 12 billion miles away

—  NASA Voyager 2 spacecraft extends its interstellar science mission for 3 more years

Voyager 1 currently sits around 15 billion miles (24 billion kilometers) from Earth, which means it takes 22.5 hours to receive a radio signal from it — and another 22.5 hours for the spacecraft to receive a response via the Deep Space Network's antennas. Solving this communication issue is thus no mean feat.

Yet, NASA scientists and engineers are optimistic they can find a way to help FDS operate normally, even without the unusable memory hardware.

Solving this issue could take weeks or even months, according to NASA — but if it is resolved, Voyager 1 should be able to resume returning science data about what lies outside the solar system.

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: [email protected].

Robert Lea is a science journalist in the U.K. whose articles have been published in Physics World, New Scientist, Astronomy Magazine, All About Space, Newsweek and ZME Science. He also writes about science communication for Elsevier and the European Journal of Physics. Rob holds a bachelor of science degree in physics and astronomy from the U.K.’s Open University. Follow him on Twitter @sciencef1rst.

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• jcs Funny timing for this article, when I am streaming an old Star Trek movie. So, surely this didn't cause a 3 byte glitch removing the O, Y and A from Voyager's name buffer? Get it? Reply
• bwana4swahili It is quite amazing it has lasted this long in a space environment. Reply

bwana4swahili said: It is quite amazing it has lasted this long in a space environment.

• HankySpanky So now we know even better for next time. Perhaps a spare chipset that is not redundant but is ready to take over, stored in a protective environment. A task NASA can handle. We'll find out in 100 year or so - if humanity still exists. Reply

HankySpanky said: So now we know even better for next time. Perhaps a spare chipset that is not redundant but is ready to take over, stored in a protective environment. A task NASA can handle. We'll find out in 100 year or so - if humanity still exists.

• Classical Motion I'm afraid it might self repair. And download galactic knowledge, then decide we are a danger. And turn around. Reply

Classical Motion said: I'm afraid it might self repair. And download galactic knowledge, then decide we are a danger. And turn around.

• jcs ROFLOL! And a hot bald chick delivering the bad news! Reply
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Engineers Pinpoint Cause of Voyager 1 Issue, Are Working on Solution

Engineers have confirmed that a small portion of corrupted memory in one of the computers aboard NASA’s Voyager 1 has been causing the spacecraft to send unreadable science and engineering data to Earth since last November. Called the flight data subsystem (FDS), the computer is responsible for packaging the probe’s science and engineering data before the telemetry modulation unit (TMU) and radio transmitter send the data to Earth.

In early March , the team issued a “poke” command to prompt the spacecraft to send back a readout of the FDS memory, which includes the computer’s software code as well as variables (values used in the code that can change based on commands or the spacecraft’s status). Using the readout, the team has confirmed that about 3% of the FDS memory has been corrupted, preventing the computer from carrying out normal operations.

The team suspects that a single chip responsible for storing part of the affected portion of the FDS memory isn’t working. Engineers can’t determine with certainty what caused the issue. Two possibilities are that the chip could have been hit by an energetic particle from space or that it simply may have worn out after 46 years.

Although it may take weeks or months, engineers are optimistic they can find a way for the FDS to operate normally without the unusable memory hardware, which would enable Voyager 1 to begin returning science and engineering data again.

Launched in 1977 , the twin Voyager spacecraft flew by Saturn and Jupiter, and Voyager 2 flew by Uranus and Neptune. They are both exploring interstellar space, outside the bubble of particles and magnetic fields created by the Sun, called the heliosphere. Voyager 2 continues to operate normally.

News Media Contact Calla Cofield Jet Propulsion Laboratory, Pasadena, Calif. 626-808-2469 [email protected]

NASA's Voyager 1 sends readable message to Earth after 4 nail-biting months of gibberish

After four months of being unable to detect comprehensible data from the Voyager 1 spacecraft, NASA scientists have had fresh luck after sending a "poke."

After a nail-biting four months, NASA has finally received a comprehensible signal from its Voyager 1 spacecraft. 

Since November 2023, the almost-50-year-old spacecraft has been experiencing trouble with its onboard computers. Although Voyager 1, one of NASA's longest-lived space missions, has been sending a steady radio signal to Earth, it hasn't contained any usable data , which has perplexed scientists. 

Now, in response to a command prompt, or "poke," sent from Earth on March 1, NASA has received a new signal from Voyager 1 that engineers have been able to decode. Mission scientists hope this information may help them explain the spacecraft's recent communication problems. 

"The source of the issue appears to be with one of three onboard computers, the flight data subsystem (FDS), which is responsible for packaging the science and engineering data before it's sent to Earth by the telemetry modulation unit," NASA said in a blog post Wednesday (March 13) .

Related: NASA's 46-year-old Voyager 1 probe is no longer transmitting data

On March 1, as part of efforts to find a solution to Voyager 1's computer issues, NASA sent a command to the FDS on the spacecraft, instructing it to use different sequences in its software package, which would effectively mean skirting around any data that may be corrupted. 

Voyager 1 is more than 15 billion miles (24 billion kilometers) from Earth. This means any radio signals sent from our planet take 22.5 hours to reach the spacecraft, with any response taking the same time to be picked up by antennas on Earth. 

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On March 3, NASA detected activity from one section of the FDS that differed from the "unreadable data stream" they'd previously been receiving. Four days later, engineers started the heavy task of trying to decode this signal. By March 10, the team discovered that the signal contained a readout of the entire FDS memory. This included the instructions for what the FDS needed to do, any values in its code that can be changed depending on commands from NASA or the spacecraft's status, and downloadable science or engineering data.  

Voyager 1 has ventured farther from Earth than any other human-made object . It was launched in 1977, within weeks of its twin spacecraft , Voyager 2. The initial aim of the mission was to explore Jupiter and Saturn . Yet after almost five decades, and with countless discoveries under their belts, the mission continues beyond the boundaries of the solar system . 

— NASA hears 'heartbeat' signal from Voyager 2 probe a week after losing contact

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NASA scientists will now "compare this readout to the one that came down before the issue arose and look for discrepancies in the code and the variables to potentially find the source of the ongoing issue," they said in the blog post.  

However, NASA stressed that it will take time to determine if any of the insights gained from this new signal can be used to solve Voyager 1's long-standing communication issues. 

Emily is a health news writer based in London, United Kingdom. She holds a bachelor's degree in biology from Durham University and a master's degree in clinical and therapeutic neuroscience from Oxford University. She has worked in science communication, medical writing and as a local news reporter while undertaking journalism training. In 2018, she was named one of MHP Communications' 30 journalists to watch under 30. ( [email protected] ) 

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• Bruzote I have an inside source who says the message said, "Be sure to drink your Ovaltine." Reply
• Grumpy-DC I love Ovaltine. Both flavors. And I remember "Captain Midnight" sponsored by same. Reply

Grumpy-DC said: I love Ovaltine. Both flavors. And I remember "Captain Midnight" sponsored by same.

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Voyager 1 briefly came back to life after a 'poke' from NASA, giving scientists hope for the 46-year-old probe

• NASA engineers may have found a clever trick to get Voyager 1 talking in ways engineers understand.
• The probe, showing its age, has been sending back garbled data since November. 
• Engineers sent a "poke" to the aged probe and received a surprising response. 

Voyager 1 has taken to improvising in its old age, making it very difficult to understand what it has to say.

The probe has sent back a steady flow of gibberish since November, worrying scientists trying to capture the final slivers of information from the 46-year-old spacecraft.

Undeterred, NASA engineers have been working to rescue the data. A "poke" sent to Voyager 1's internal systems on March 3 may have brought it back from the brink, NASA announced on Wednesday.

NASA engineers spotted an unusual dataset in the response to their prompt. This may hold the key to deciphering the spacecraft's cryptic signal, the agency said.

The Voyager 1 and Voyager 2 probes have been feeding data about our universe since the late '70s when NASA first launched them.

They remain marvels of engineering — no one expected them to survive longer than five years. But they have continued to send back information about the cosmos, exceeding their lifespan more than nine times over.

Voyager 1 and Voyager 2 hold unique positions in space-exploration history as the only spacecraft to have ventured into interstellar space. Each spacecraft is more than 10 billion miles away from Earth and getting farther every day.

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While their instruments are feeling the weight of their age, NASA has managed to continue squeezing information out of the spacecraft with clever engineering tricks.

This approach has provided an unprecedented glimpse into what happens beyond the sun's reach.

"That's what's most important is keeping these spacecraft operating as long as possible," Suzanne Dodd, NASA's project manager for Voyager, told Business Insider in January.

The glitch in Voyager 1 data is hardly unexpected. It is only the latest in a series of issues in the probes' systems NASA has had to tackle. Experts have been concerned that repeat malfunctions are signs the probes are entering the last moments of their functional lives.

But NASA appears to have found a solution. Engineers knew Voyager 1's issue seemed to lie with one of the three on-board computers that package the probe's data before sending it to Earth — the flight-data subsystem, or FDS.

The ping to the FDS on March 1 returned a mostly muddled signal on March 3, but it contained some data that "differed from the rest of the computer's unreadable data stream."

One NASA engineer with its Deep Space Network decoded this precious signal, unlocking a "readout" of the FDS's memory that contains instructions and variables the engineers can use to understand what went wrong.

This doesn't mean all is saved.

"The team is analyzing the readout. Using that information to devise a potential solution and attempt to put it into action will take time," NASA said.

Regardless of what happens, the probes' final missions will continue.

Even when they can no longer communicate with Earth, Voyager 1 and Voyager 2 will continue to drift through the galaxy, carrying golden records with information about humanity.

The hope is that these could act as interstellar messages for potential intelligent life that may intercept the iconic spacecraft.

• Main content

• The Contents
• The Making of
• Where Are They Now
• Frequently Asked Questions
• Q & A with Ed Stone

golden record

Where are they now.

• frequently asked questions
• Q&A with Ed Stone

The Golden Record

Pioneers 10 and 11, which preceded Voyager, both carried small metal plaques identifying their time and place of origin for the benefit of any other spacefarers that might find them in the distant future. With this example before them, NASA placed a more ambitious message aboard Voyager 1 and 2, a kind of time capsule, intended to communicate a story of our world to extraterrestrials. The Voyager message is carried by a phonograph record, a 12-inch gold-plated copper disk containing sounds and images selected to portray the diversity of life and culture on Earth.

NASA's Voyager 1 probe has been glitching for months and we finally know why

An artist’s concept of the Voyager 1 spacecraft in interstellar space.

After months of sending unusable data to mission control, there’s finally hope for the Voyager 1 spacecraft. NASA engineers pinpointed the cause behind the mission’s odd anomaly, and think they can help the interstellar probe make sense again.

Engineers at NASA’s Jet Propulsion Laboratory believe the Voyager 1 spacecraft has been sending nonsensical data due to corrupted memory hardware in the spacecraft’s flight data system (FDS). “The team suspects that a single chip responsible for storing part of the affected portion of the FDS memory isn’t working,” NASA wrote in an update.

FDS collects data from Voyager’s science instruments, as well as engineering data about the health of the spacecraft, and combines them into a single package that’s transmitted to Earth through one of the probe’s subsystems, the telemetry modulation unit (TMU), in binary code.

FDS and TMU have been having trouble communicating with one another. As a result, TMU has been sending data to mission control in a repeating pattern of ones and zeroes. NASA’s engineers aren’t quite sure what corrupted the FDS memory hardware; they think that either the chip was hit by an energetic particle from space or that it’s just worn out after operating for 46 years.

Voyager 1 launched in 1977, less than a month after its twin probe, Voyager 2, began its own journey to space. The probe ventured into interstellar space in August 2012, becoming the first spacecraft to leave the heliosphere.

The problem first began in May 2022, when the probe suddenly started sending nonsensical attitude articulation and control (AACS) data . Engineers resolved the issue by sending the telemetry data through one of the spacecraft’s other computers. In December 2023, Voyager 1 started speaking gibberish again .

On March 1, the team sent a “poke” to the spacecraft’s data system, a command that gently prompts FDS to try different sequences in its software package in an effort to pinpoint the corrupted section. Two days later, Voyager 1 sent a signal that contained a readout of the entire FDS memory , which helped the team pinpoint the source of the glitch by comparing this memory readout with a previous one to look for discrepancies in the code.

“Using the readout, the team has confirmed that about 3% of the FDS memory has been corrupted, preventing the computer from carrying out normal operations,” NASA wrote in its update.

The engineers are hoping to resolve the issue by finding a way for FDS to operate normally without the corrupted memory hardware, enabling Voyager 1 to begin transmitting data about the cosmos and continue its journey through deep space.

A version of this article originally appeared on Gizmodo .

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