What did NASA do to Voyager 1’s power?

NASA shuts down a Voyager 1 instrument to save power

NASA has taken a power-saving step on Voyager 1, a spacecraft that has been traveling for 49 years. NPR reports that Voyager 1 is running out of power, leading NASA to switch part of the spacecraft off.

What caused the change

Voyager 1 relies on a radioisotope thermoelectric generator (RTG), a system that converts heat from radioactive decay into electricity. Over decades, that power source produces steadily less usable energy, forcing mission managers to ration systems.

What NASA reportedly did

To keep the spacecraft operational, NASA shut down an instrument on Voyager 1. The excerpted coverage frames this as a deliberate act to preserve power for essential spacecraft functions.

Why it matters

Voyager 1 is among the most important long-duration missions ever launched, still providing scientific data from interstellar space. Power rationing is a natural consequence of the RTG’s aging, but each shutdown is also a reminder that the mission’s operating margin is shrinking.

This kind of decision can also inform planning for other deep-space missions using similar power systems: it demonstrates how long-lived spacecraft increasingly depend on careful prioritization as energy budgets tighten.

While the stories confirm the power shortage and the fact that an instrument was turned off, they don’t specify which exact instrument was disabled or what remaining scientific payload is next on the rationing list.