NASA engineers shut down the Low-energy Charged Particles experiment on Voyager 1 to conserve power for the aging spacecraft. The instrument, which has been operating since the probe's launch in 1977, measures charged particles and cosmic rays in interstellar space. This shutdown marks the seventh instrument turned off on Voyager 1 as the mission team works to extend the spacecraft's operational life.

Voyager 1 and its twin rely on radioisotope thermoelectric generators that lose about 4 watts of power annually. With nearly 50 years of space travel behind them, power margins have become razor thin. The shutdown decision came after an unexpected power drop during a routine maneuver in February triggered concerns about the spacecraft's undervoltage protection system. Mission managers had planned this instrument shutdown years in advance as part of a strategy to keep the spacecraft operational.

The team is now preparing for an ambitious power-saving measure called "the Big Bang," which involves swapping out multiple powered devices simultaneously. This fix will be tested on Voyager 2 first due to its closer proximity to Earth and slightly better power reserves. If successful, the team hopes to potentially reactivate the LECP instrument on Voyager 1, extending humanity's ability to gather data from interstellar space beyond what any other human-made craft has achieved.