Nearly 49 years after launch and more than 21 billion kilometers from Earth, Voyager 2 just got a reprieve it wasn’t guaranteed to receive. As confirmed in NASA’s own August 4 mission update on the agency’s Voyager blog, engineers at the Jet Propulsion Laboratory successfully completed a power-saving maneuver nicknamed the “Big Bang,” freeing up enough electricity to keep the spacecraft’s three remaining science instruments running for at least another year. Live Science, the Indian Express, and Space.com have all corroborated the update and NASA’s own account of how the fix works.
Without the maneuver, Voyager 2 would have been forced to shut down another one of its instruments before the end of 2026, a loss NASA and outside scientists have both described as permanent and irreplaceable, given that no other spacecraft currently operates in interstellar space.
NASA described the effort as swapping out a group of powered devices all at once, rather than adjusting power draw one small change at a time, which is where the nickname comes from. Engineers turned off certain higher-power components and substituted lower-power alternatives in their place, all while making sure Voyager 2 stayed warm enough to keep operating in the deep cold beyond the heliosphere, the protective bubble of solar wind and magnetic fields that marks the edge of the solar system’s influence.
NASA has been careful not to frame this as a permanent fix. Both Voyager probes lose roughly 4 watts of power every year as their plutonium-fueled radioisotope thermoelectric generators continue to decay, a decline that can’t be reversed. The Big Bang maneuver buys time against that ongoing loss rather than stopping it, with NASA’s own estimate putting the gain at least a year, and Scientific American reporting the team believes it could stretch to as much as two years under the right conditions.
Each Voyager spacecraft originally carried 10 science instruments. Since 2024, the mission has already had to power down two instruments on each probe as electricity margins grew thin, following a sequencing plan the science and engineering teams had agreed on years in advance, prioritizing which instruments to lose first based on scientific value against power cost. Voyager 2 now runs on just three remaining instruments, and losing a fourth would have meant permanently reducing humanity’s only in-situ sensor network in interstellar space to two working instruments, a gap NASA has said no funded or planned mission could replace.
Kareem Badaruddin, Voyager mission manager at JPL, called the maneuver “the most important thing we’ve done on the Voyager spacecraft in decades,” a notable statement given how many novel engineering fixes the nearly five-decade-old mission has already required to stay alive this long.
Part of what makes this maneuver especially delicate is the sheer distance involved. A radio signal from Earth takes roughly 19.5 hours to reach Voyager 2, meaning a single command and its earliest confirming reply span close to 39 hours round-trip, before accounting for the time needed for the spacecraft to actually execute the instruction or for engineers to analyze the results back on Earth. Coordinating a simultaneous swap of multiple powered systems under that kind of communication lag, on a spacecraft engineers can’t physically service or send replacement parts to, is part of why NASA and outside scientists have described the procedure as both risky and painstaking to pull off correctly.
With Voyager 2’s fix confirmed successful, JPL’s team now plans to perform the same Big Bang procedure on Voyager 1, which sits even farther from Earth at roughly 25.4 billion kilometers away. NASA has said it aims to complete that effort in the coming months, though the same distance and communication-lag challenges apply, and possibly more acutely, given Voyager 1’s greater distance.
The clearest next milestone is whether the Voyager 1 version of the Big Bang maneuver succeeds using the same approach, or whether Voyager 1’s greater distance and different instrument configuration require adjustments. Beyond that, both spacecraft remain on a one-way trajectory toward an eventual full power-down sometime in the 2030s, a timeline NASA has acknowledged for years, with each successful power-saving fix like this one treated as extending the mission’s remaining scientific window rather than changing its ultimate endpoint.