Voyager 1 Is 24 Billion Kilometers From Earth. It Had a Computer Meltdown in 2023. NASA Fixed It — and the Fix Took 45 Hours Just to Confirm.

The Farthest Thing Humans Have Ever Built

Right now, a spacecraft the size of a compact car is drifting through interstellar space — the void between the stars — at 17 kilometers per second. It was launched in 1977. It runs on less power than a household lightbulb. And last year, it started sending gibberish.

Not silence. Gibberish. The most distant human-made object in history was having a breakdown 24 billion kilometers from Earth. And a team of engineers had to fix it — using 50-year-old documentation, consulting retired colleagues, and waiting 45 hours just to find out if a single command had worked.

Where It Actually Is

Voyager 1 is 161 AU from Earth. One AU is the distance from Earth to the Sun — about 150 million kilometers. Multiply that by 161. That's where this 47-year-old probe is right now, drifting silently through the space between solar systems.

On August 25, 2012, it crossed the heliopause — the boundary where the Sun's influence gives way to the interstellar medium. Solar wind: gone. Galactic cosmic rays: surging. Voyager 1 was no longer in our solar system. No human-made object had ever been there before. It still holds that record.

To reach it with radio signals traveling at the speed of light, you wait 22 hours and 35 minutes. To ask a question and get an answer: nearly two full days.

The 2023 Breakdown

In late 2023, Voyager 1's telemetry went wrong. Not silent — the spacecraft was still alive, still receiving commands, still transmitting. But the data coming back was corrupted. Unreadable. Engineers at NASA's Jet Propulsion Laboratory stared at screens full of noise where science data should have been.

The culprit turned out to be a single corrupted chip in the flight data subsystem — one of three onboard computers managing the spacecraft. A chip that had been running continuously since 1977.

The fix required routing code around the damaged memory section and redistributing the software across other chips. Sounds straightforward. Except every command they sent took 22.5 hours one way. Send a command: wait 22.5 hours. Check if it worked: wait another 22.5 hours. Every single diagnostic step took the better part of two days to confirm.

In April 2024, after five months of troubleshooting, Voyager 1 resumed sending coherent scientific data. The team had debugged a computer from 24 billion kilometers away, using technology built before the personal computer existed, in a programming language most modern engineers have never seen.

Running on Fumes

Voyager 1 gets its power from radioisotope thermoelectric generators — RTGs, devices that convert heat from decaying plutonium-238 into electricity. At launch in 1977, they produced 470 watts. Today, after 47 years of radioactive decay, they produce roughly 250 watts.

That's less than three standard lightbulbs.

NASA has been turning off instruments for decades to preserve what's left. The cameras went dark in 1990 — the famous Pale Blue Dot photograph of Earth was one of the last images taken. The plasma subsystem. Various sensors. One by one, turned off to keep the remaining science instruments alive a little longer.

The estimate: sometime between 2025 and 2030, there won't be enough power to run a single instrument. The signal will go quiet. For the first time in nearly half a century, nobody will be home on Voyager 1.

What's Bolted to Its Side

Before Voyager 1 launched, Carl Sagan's team faced a strange assignment. This spacecraft might one day leave the solar system entirely. It might drift for billions of years. It might be found.

So they built a message and bolted it to the spacecraft. A gold-plated copper disc — the Golden Record — containing 116 images of Earth, the sounds of surf and thunder and laughter, greetings in 55 languages, and music from 27 cultures: Bach, Beethoven, Chuck Berry's Johnny B. Goode, Indian classical ragas, Azerbaijani folk songs, a Peruvian wedding song.

A message in a bottle thrown into the largest ocean that exists.

That record is currently 161 AU from Earth, drifting through interstellar space, completely intact. It has a shelf life estimated in the billions of years — long after Earth's oceans have evaporated and the Sun has expanded into a red giant.

After the Signal Dies

When the power fails and the transmitters go dark, Voyager 1 doesn't stop. It just stops talking. It keeps flying at 17 kilometers per second through interstellar space — no engine, no steering, just inertia built up from a Jupiter gravity assist in 1979 that's been carrying it ever since.

In approximately 40,000 years, Voyager 1 will make its closest pass to another star: AC+79 3888, a dim red dwarf in the constellation Camelopardalis, about 1.6 light-years away. It won't stop. It won't slow down. It will drift past and keep going.

In millions of years — longer than modern humans have existed, longer than our species will likely survive — Voyager 1 will still be out there. Silent. With a golden record bolted to its side, carrying sounds of a planet that may no longer exist.

The Other One

Voyager 2 launched two weeks before Voyager 1, on August 20, 1977 — but took a slower trajectory that allowed it to visit all four outer planets: Jupiter, Saturn, Uranus, and Neptune. It's the only spacecraft in history to visit all four. It crossed the heliopause on November 5, 2018, entering interstellar space from a different direction than its twin.

Both are still transmitting. Two faint radio signals from the dark between the stars — detectable only by the largest dish antennas on Earth, barely visible above the noise floor of the universe.

You can read about what's currently orbiting Earth — the 15,699 satellites tracked by SkyLens's live tracker — but Voyager 1 is so far beyond that picture that no display could fit them on the same screen. The tracker shows objects a few hundred to a few thousand kilometers up. Voyager 1 is 24 billion kilometers out.

Why This Should Bother You a Little

Voyager 1 was designed to operate for five years. It has operated for 47. The team that fixed it last year included people consulting handwritten notes from engineers who built it in the 1960s and 70s. They were debugging hardware older than most of the internet. They succeeded.

There is no mission currently planned to follow Voyager into interstellar space. No spacecraft launched since has come close to matching its distance. The next probe to reach interstellar space — if one is approved and launched soon — would arrive sometime in the 2070s.

Until then, these two spacecraft are our only eyes in the dark between stars.

And one of them just barely survived a computer breakdown.

If you want to explore more space stories like this — missions, mysteries, and what's happening in orbit right now — check out the SkyLens blog or dig into our space explainer library.