Voyager 1 is the most distant spacecraft from Earth, currently journeying through uncharted interstellar space. Recently, NASA made a strategic decision to power down one of its scientific instruments, the Low-energy Charged Particles experiment (LECP). This move aims to conserve energy as the spacecraft drifts further away from our planet.
On April 17, NASA deactivated the LECP to save power. This experiment helped study the makeup of the space between stars. Notably, Voyager 2, Voyager 1’s twin, had a similar instrument turned off in March 2025 to extend its operational life.
Both Voyagers were launched in 1977 with a set of ten instruments designed for their missions to the outer planets. As of now, Voyager 1 is about 25.4 billion kilometers (16 billion miles) away from Earth, while Voyager 2 is approximately 21.35 billion kilometers (13 billion miles) away. These probes are the only active spacecraft beyond the heliosphere, which is a protective bubble around our solar system created by the Sun’s magnetic field and particles.
“Turning off an instrument isn’t ideal, but it’s the best we can do,” said Kareem Badaruddin, Voyager’s mission manager at NASA’s Jet Propulsion Laboratory. Fortunately, Voyager 1 still has two operational instruments that measure plasma waves and magnetic fields. These instruments continue to send back invaluable data from regions of space that have never been explored.
The decision to shut down LECP highlights the challenge the team faces in managing limited power. Both Voyager probes use radioisotope thermoelectric generators to convert heat from decaying plutonium into electricity. Since launch, they have been losing about 4 watts of power every year. This slow power decline requires engineers to carefully balance operations, ensuring that the spacecraft remain warm while collecting scientific data.
Shutting down parts of the spacecraft could leave it vulnerable. If temperatures drop too low, critical systems might fail, and the connection to Earth could be lost. The team believes that turning off LECP allows Voyager 1 to function with its remaining instruments for about a year, which could stretch its mission time to nearly 50 years. That milestone opens the door for ambitious plans, like a proposed upgrade called “the Big Bang,” which might enable the spacecraft to explore even deeper into space.
In a recent maneuver on February 27, Voyager 1 experienced a power drop, prompting the team to consult a pre-set list of priorities for shutting down less critical instruments. The LECP was at the top of that list, after nearly 49 years of providing insights into cosmic rays and particles from the solar system and beyond. The instrument has helped scientists understand when Voyager crossed into interstellar space.
The team is optimistic about the upcoming plans. If “the Big Bang” is successful on Voyager 2 this summer, they will try the same approach on Voyager 1. This might even allow LECP to resume its vital work if enough power becomes available.
Moreover, many engineers and scientists continuously share their enthusiasm for the Voyagers on social media. Tweets and posts often celebrate milestones and discuss fascinating findings, capturing public interest in the ongoing missions. Matt Hill, a principal investigator for LECP, expressed hope for the future: “We continue to learn from these missions, and the surprises of distance and space keep us motivated.”
The legacy of the Voyager missions is remarkable; they show how human curiosity and engineering prowess can push the boundaries of discovery, even after decades in the harsh environment of space.
