NASA's "Big Bang" Maneuver Buys Voyager 2 at Least One More Year in Deep Space

A High-Stakes Swap Billions of Miles From Home

Voyager 2's interstellar instruments will keep transmitting data for at least one more year after NASA's Jet Propulsion Laboratory completed a high-stakes power swap on August 4, 2026 — a simultaneous procedure, nicknamed the "Big Bang," that preserved the spacecraft's three remaining sensors in deep space. It's the kind of engineering triumph that sounds simple on paper but was anything but in practice, and it may be one of the last major lifelines available to one of humanity's most storied scientific missions.

The maneuver involved simultaneously turning off three devices — an old tape recorder and two heaters — while turning on three others — two different heaters and a propulsion instrument — in a carefully choreographed shuffle that reduces power demand by nearly 10 watts per year without any critical components becoming too cold. The timing and coordination of the swap were everything. Some devices must stay warm during the transition, and the entire load calculation must work out from the first moment the swap occurs — there is no room for error when your spacecraft is over 13 billion miles away.

Why Power Is So Precious on Voyager 2

The Voyagers get their power from radioisotope thermoelectric generators — devices that convert heat from decaying plutonium into electricity. Due to the plutonium supply continually depleting, both probes lose about 4 watts of power each year. Over nearly five decades in space, that slow bleed has become a crisis. After almost a half-century since launch, the spacecraft's power margins have grown razor thin, requiring the team to conserve energy by shutting off non-essential devices and systems.

The challenge is that heat and power are deeply intertwined on these probes. The plutonium decay and the spacecraft operations it powers also produce the heat that keeps each Voyager operational: if the fuel lines feeding one of these spacecraft's thrusters were to freeze, the probe would fall silent, and its storied mission would come to an end. As one NASA engineer put it, "at this point, almost everything functions as a heater, no matter what it was designed to do." That's why the tape recorder — long obsolete as a data-storage device — was still running. It was keeping the spacecraft warm.

Months of Planning, One Shot to Get It Right

Engineers spent months pondering the approach in late 2025 and early 2026, when the only antenna able to communicate with Voyager 2 was down for repair anyway. That downtime became an opportunity to think through every possible failure scenario. The Voyager team took steps in May and June to test that the Big Bang wouldn't draw more power than expected or lower temperatures beyond acceptable limits. Then, on July 9, they pulled the trigger. It takes nearly 20 hours for a command to reach Voyager 2, and then the team has to wait the same amount of time to receive a response before — meaning the team sent the commands and then simply had to wait, hoping their calculations were right.

Since 2024, the dwindling power budget had already forced the mission to deactivate two science instruments on each spacecraft. Voyager 2's Plasma Science Instrument was switched off in late September 2024, followed by its Low-Energy Charged Particle instrument in March 2025. Without the Big Bang activity, the mission would have had to turn off another instrument on Voyager 2 before the end of 2026. That would have left humanity with just two sensors operating in interstellar space — a loss that no currently planned mission could replace.

What Comes Next for the Voyager Program

The mission team plans to perform the same swap on Voyager 1, which is farther from Earth than Voyager 2, and to complete the effort in the coming months. Voyager 1 is currently down to two operating instruments, and its power level dropped unexpectedly during a roll maneuver on February 27, forcing engineers to act quickly — at least as quickly as is possible when commands take more than 23 hours to reach the spacecraft.

If all goes as planned, it's possible that at least one instrument aboard one or both of the historic explorers can continue communicating with humanity into the 2030s. That would be a remarkable achievement for spacecraft launched in 1977, now serving as humanity's only firsthand sensors in interstellar space. Every additional year of data they return is irreplaceable — a window into a region of the universe no other probe has ever reached, kept alive by engineers refusing to let go.