NASA Restores Voyager 1 Data After 3% Memory Failure 24 Billion Kilometers Away

Q: With its memory fixed, can NASA's risky 'Big Bang' maneuver next month prevent Voyager 1 from finally going silent?

No. NASA’s “Big Bang” maneuver may keep Voyager 1 talking longer, but it is not expected to stop the spacecraft from eventually going silent. The memory repair completed in 2024 solved a communications failure caused by a bad chip in Voyager 1’s flight data subsystem. That fix restored readable engineering and science data, but it did not address the mission’s deeper problem: power. Voyager 1’s radioisotope power source keeps weakening, losing about 4 watts a year, and the spacecraft now operates with very little margin. The “Big Bang” is a power-saving gamble aimed at buying time. Engineers plan to switch off three heaters that keep thruster fuel lines warm and replace them with three lower-power alternatives that can do the same job, saving nearly 10 watts. NASA is testing the approach on Voyager 2 in May and June 2026, with Voyager 1 to follow no earlier than July if the tests succeed. If it works, the maneuver could postpone the shutdown of another science instrument by at least a year and might even allow NASA to restore Voyager 1’s recently switched-off Low-Energy Charged Particles instrument. That could help the spacecraft continue science operations into the early 2030s. But the move is best understood as life extension, not rescue. The power supply will keep declining, and eventually Voyager 1 will no longer have enough electricity to run instruments or maintain its radio link to Earth. The “Big Bang” could delay that moment, not prevent it.

2 articles · Updated · spacedaily.com · Jun 20

Voyager 1 resumed sending readable engineering data on April 20, 2024, after NASA uplinked a software patch to the probe more than 24 billion kilometers from Earth; science data followed in subsequent weeks.
A single failed chip had corrupted about 3% of the flight data subsystem's memory, leaving the spacecraft alive and pointed at Earth but stuck transmitting a useless repeating pattern since Nov. 14, 2023.
NASA could not repair the 1970s-era hardware, so engineers split the damaged software into smaller sections, moved them into working memory, and rewrote internal references so the program could run around the dead area.
Each command took about 22.5 hours to reach Voyager 1 and another 22.5 hours for a reply, making every test a roughly 45-hour cycle and turning diagnosis and repair into months of remote trial and verification.
Launched in 1977, Voyager 1 remains the most distant human-made object; with power fading by a few watts a year, the fix preserves time for a mission NASA hopes can continue into the 2030s.

Sources

spacedaily.com17h ago

NASA Engineers Fix Voyager 1 Software, Restore Data Transmission

MSN17h ago

Voyager 1 resumes science operations after deep-space repair

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Voyager 1’s 2024 Comeback: How NASA Remotely Repaired a 15-Billion-Mile Spacecraft After Months of Silence

Overview

In November 2023, Voyager 1 began sending garbled data due to a grave computer problem traced to a failed memory chip in its Flight Data Subsystem. This left mission control unable to receive vital engineering updates, and the immense distance—over 15 billion miles—made troubleshooting extremely slow, with each command taking nearly two days for a round trip. Since the faulty chip could not be repaired, NASA engineers created a clever software workaround to bypass the damaged memory. Their solution restored Voyager 1’s ability to send usable data in April 2024, marking a major achievement in deep-space engineering.

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