NASA Keeps 47-Year-Old Voyager 2 Alive With Power Trick

A spacecraft older than most of its mission controllers is getting a new lease on life, and it's happening 13 billion miles from Earth.

NASA engineers at the Jet Propulsion Laboratory just pulled off a delicate power-saving maneuver to extend Voyager 2's mission by at least another year. The nearly 50-year-old spacecraft has been running on borrowed time, losing about four watts of power annually as its plutonium fuel slowly decays.

Voyager 2 doesn't use solar panels because sunlight is far too weak at its current distance. Instead, it relies on three radioisotope thermoelectric generators that convert heat from decaying plutonium-238 into electricity. But as the fuel decays, the power supply shrinks.

The spacecraft launched from Cape Canaveral on August 20, 1977, with a mission to explore the outer planets. It became the first and only spacecraft to visit Uranus and Neptune, flying past Jupiter, Saturn, Uranus, and Neptune before heading into the cosmic unknown.

In 2018, Voyager 2 crossed into interstellar space, becoming only the second human-made object to leave the protective bubble of our Sun's influence. It's still sending scientific data back to Earth, though every radio signal takes nearly 20 hours to arrive.

The recent power crisis forced NASA to get creative. Engineers performed what they call the "Big Bang," a carefully orchestrated shutdown of certain systems and a switch to lower-power alternatives. The challenge wasn't just conserving electricity but making sure the spacecraft wouldn't freeze in the brutal cold of deep space.

Every watt had to be carefully allocated. Save too much power in the wrong place, and critical systems could fail from the cold. The engineers essentially performed surgery on a 1977 computer from 13 billion miles away, waiting almost 40 hours between each command and response.

Why This Inspires

Voyager 2 was built when the first Star Wars movie was in theaters and personal computers were just entering homes. Yet it's still working, still exploring, still teaching us about the universe beyond our solar system.

The mission represents pure human persistence. Over the years, NASA has systematically turned off heaters and instruments to conserve power, making impossible choices about what to save and what to sacrifice. Since 2024 alone, two science instruments on each Voyager spacecraft have gone dark.

Now, thanks to this latest trick, Voyager 2's three remaining science instruments can keep collecting data from a place no other spacecraft has ever been. NASA plans to perform the same maneuver on Voyager 1 in the coming months.

When Voyager 2 marks 49 years in space this August, it will be farther from home than ever, still pointing its antenna toward Earth and still sharing what it finds in the darkness between stars.