The engineering miracle of keeping a 50-year-old probe alive
In short: Designed to last only five years, the Voyager probes have survived half a century in deep space. They are currently navigating the mysterious frontier beyond our Sun's influence, powered by decaying plutonium and maintained by ingenious remote surgery from millions of miles away.
Launched during a rare planetary alignment, Voyager 1 and 2 were intended as short-term explorers. Rather, these crafts served as our species' initial envoys into deep space, traversing the heliosphere—a shield of magnetic forces and particles produced by the Sun. Along their journey, they provided groundbreaking data on active volcanoes on Io, hidden rings around Jupiter, and strange magnetic structures at the edge of the solar system.
The primary challenge today is a dwindling energy supply. Both spacecraft rely on radioisotope thermoelectric generators that convert heat from decaying plutonium into electricity. This supply diminishes steadily, causing each probe to lose approximately 4 watts of available power every year. To combat this, NASA engineers at the Jet Propulsion Laboratory executed a maneuver nicknamed the "Big Bang." They simultaneously shut down power-hungry hardware and replaced it with lower-power alternatives while ensuring the spacecraft remained warm enough to function.
These efforts are critical for survival; without the "Big Bang" power-saving operation, Voyager 2 would have been forced to deactivate another science instrument before the end of 2026. Currently, each craft operates only a few remaining instruments, as many others were deactivated years ago during their planetary encounters or due to performance degradation. By 2026, Voyager 1 is expected to reach a milestone of 16.094 billion miles from Earth—a distance light travels in just 24 hours.
As these machines approach their eventual silence, they represent a triumph of 1970s technology. They continue to provide unique data from outside the heliosphere, offering a perspective on the cosmos that no other human-made object can currently replicate.
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Sources
- Summary by Intellect · source: What Voyager Found Out There After 50 Years
- Also: Where Are Voyager 1 and 2 Now? - NASA Science
- Also: Voyager 2 was running out of power. NASA just bought it more time
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