On April 17, 2026, engineers at NASA’s Jet Propulsion Laboratory (JPL) in Southern California executed commands to deactivate the Low-energy Charged Particles experiment (LECP) aboard Voyager 1. This decision was made as the nuclear-powered spacecraft faces dwindling power reserves, and turning off the LECP is deemed the most effective strategy to prolong its operational life.
The LECP has been a vital instrument since Voyager 1’s launch in 1977, functioning almost continuously for nearly 49 years. It measures low-energy charged particles, including ions, electrons, and cosmic rays from both our solar system and beyond. This data has been crucial for understanding the interstellar medium, allowing scientists to detect pressure fronts and varying particle densities in the space that lies beyond our heliosphere. Notably, the twin Voyager spacecraft are uniquely positioned to gather this information, being the only probes so far from Earth.
Both Voyager 1 and its twin, Voyager 2, utilize a radioisotope thermoelectric generator that converts heat from decaying plutonium into electricity. Each probe loses approximately 4 watts of power annually. After decades of operation, power margins have become critically low, necessitating energy conservation measures such as shutting off heaters and instruments to prevent the spacecraft from becoming too cold.
During a routine roll maneuver on February 27, 2026, Voyager 1 experienced an unexpected drop in power levels. Engineers recognized that any further decline could activate the spacecraft’s undervoltage fault protection system, which would autonomously shut down components to protect the probe, complicating recovery efforts. To avoid this, the team acted preemptively.
“While shutting down a science instrument is not anybody’s preference, it is the best option available,” stated Kareem Badaruddin, Voyager mission manager at JPL. Currently, Voyager 1 retains two operational science instruments: one that detects plasma waves and another that measures magnetic fields, both of which continue to send valuable data from uncharted regions of space.
Strategic Shutdown Plan
The decision regarding which instrument to deactivate was not made hastily. Years prior, the Voyager science and engineering teams collaboratively established a sequence for shutting down spacecraft components while ensuring ongoing scientific operations. So far, seven out of ten identical instrument sets on each spacecraft have been turned off, with the LECP being the next on Voyager 1’s list. The LECP on Voyager 2 was deactivated in March 2025.
Given that Voyager 1 is over 15 billion miles (approximately 25 billion kilometers) from Earth, the commands to shut down the LECP will take about 23 hours to reach the spacecraft, with the shutdown process itself estimated to last around three hours and 15 minutes. However, a small motor that allows the LECP sensor to rotate will remain operational, consuming only 0.5 watts of power, which keeps open the possibility of reactivating the instrument if power becomes available.
Future Plans
Engineers anticipate that deactivating the LECP will provide Voyager 1 with approximately a year of operational leeway. During this period, they are finalizing a significant energy-saving initiative dubbed “the Big Bang.” This plan aims to replace a group of powered devices simultaneously, allowing some components to be turned off while introducing lower-power alternatives to maintain the spacecraft’s temperature and continue scientific data collection.
The Big Bang will first be tested on Voyager 2, which has more power reserves and is closer to Earth, making it a safer candidate for this experimental procedure. Tests are scheduled for May and June 2026, with plans to implement similar measures on Voyager 1 no earlier than July. If successful, there may even be a chance to reactivate the LECP on Voyager 1.
This article was produced by NeonPulse.today using human and AI-assisted editorial processes, based on publicly available information. Content may be edited for clarity and style.
