Official NASA/JPL-Caltech artist’s concept; not documentary imagery of the 2026 operation.
NASA engineers say a coordinated power-saving operation on Voyager 2 has succeeded, freeing enough electricity to keep the spacecraft’s three remaining science instruments operating for at least an extra year.
According to NASA’s August 4, 2026 mission update, the change prevented a further instrument shutdown that would otherwise have been needed before the end of 2026.
The operation is an engineering reprieve, not a new guarantee for the mission. Voyager 2’s power supply will continue to weaken as the spacecraft approaches its 49th anniversary in space.
What changed aboard Voyager 2?
The Voyager team calls the operation the “Big Bang”. The nickname refers to making several power changes together; it does not describe an explosion.
Engineers simultaneously switched off certain powered devices and substituted lower-power alternatives. The challenge was to reduce electricity use while keeping the spacecraft warm enough to operate.
NASA had outlined the plan in April, when it said Voyager 2 would receive the change first. Voyager 2 had slightly more power available and is closer to Earth than Voyager 1, making it the safer spacecraft on which to test the procedure.
The successful result means Voyager 2 can continue using all three of its remaining science instruments instead of shutting one down during 2026.
Why is Voyager running short of power?
Voyager 2 gets its electricity from radioisotope thermoelectric generators. These devices convert heat from the natural decay of plutonium-238 into electrical power.
As that radioactive material decays, the generators produce less electricity. NASA says each Voyager spacecraft loses about four watts of available power every year.
That decline has accumulated over nearly five decades. Mission engineers have progressively switched off heaters, instruments and other systems while trying to preserve the functions needed to communicate with Earth and collect science data.
Voyager 2 launched on August 20, 1977. It remains the only spacecraft to have visited Uranus and Neptune and entered interstellar space in 2018 after crossing the heliopause, the outer boundary of the Sun’s protective bubble.
What science still works?
NASA’s spacecraft and instrument-status page lists three operating science instruments on Voyager 2:
- The Cosmic Ray Subsystem measures high-energy particles.
- The magnetometer measures magnetic fields.
- The Plasma Wave Subsystem detects waves in plasma, the electrically charged gas found in space.
These instruments continue collecting information from interstellar space, a region no functioning spacecraft other than the two Voyagers has reached.
Voyager 2’s cameras and several instruments used during its planetary encounters were switched off years ago. More recent shutdowns have been driven by the shrinking power supply: its Plasma Science instrument was turned off in September 2024, followed by the Low-Energy Charged Particles instrument in March 2025.
What happens next?
“At least an extra year” is a power estimate, not a new end date for the mission. NASA has not guaranteed that Voyager 2 will remain operational for a particular period, and its electricity supply will continue declining.
The mission team plans to perform the same power-saving swap on Voyager 1 in the coming months. NASA’s August 4 update described that work as still planned; it did not say the operation had already been completed on Voyager 1.
For Voyager 2, the immediate result is clear: engineers have postponed another science shutdown and created more time for three instruments to study the space beyond the Sun’s heliosphere.
