Voyager 1 Still Runs on 1970s Hardware as It Reaches Interstellar Space
TL;DR
Voyager 1 is controlled by three redundant, 1970s-era computer subsystems with only tens of kilobytes of memory and an effective 8,000-instruction-per-second pace. Yet its longevity is by design: compact, interrupt‑driven software with autonomous fault protection, plus power from decaying plutonium, keeps the probe alive nearly 50 years after launch while Earth handles navigation and data. As of 2026, two science instruments remain active despite energy constraints, illustrating that reliability and longevity trump raw speed in deep-space missions.
- The computers guiding Voyager 1 through interstellar space process roughly 8,000 instructions per second; a modern smartphone processes more than 14 billion — yet that 1970s machine has operated for nearly half a century, farther from Earth than any spa Space Daily
- A glimpse of home was among the last images Voyager 1’s cameras ever sent. Just 34 minutes after taking the most distant photo of Earth ever, the cameras were powered off to conserve energy — going dark for good Space Daily
- Voyager 1 on track to reach one light-day from Earth it-online.co.za
- NASA's Voyager 1 Radio Transmitter Is Weaker Than a Refrigerator Lightbulb. It Still Reaches Earth From 15 Billion Miles Away 19FortyFive
- Voyager 1 is still transmitting from more than 25 billion kilometres away, powered by less than 250 watts of decaying plutonium — a signal that now takes over 23 hours to reach Earth, carried by a radio no stronger than a refrigerator lightbulb Make Tech Easier
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