Voyager is slowly going dark. NASA has been forced to shut down one of Voyager 1’s science instruments to keep the legendary spacecraft alive. After nearly 49 years of continuous operation, engineers have officially powered down the Low-Energy Charged Particle (LECP) sensor on Voyager 1, now located more than 15 billion miles from Earth. The move was not due to instrument failure, but rather a deliberate survival strategy. The spacecraft’s plutonium-powered generators lose about four watts of electricity every year. By deactivating this instrument, mission controllers hope to prevent a critical power shortage that could cause the entire spacecraft to shut down permanently. At this immense distance, communication is extremely challenging — it takes roughly 23 hours for a signal to travel one way between Earth and Voyager 1. Although the loss of the particle sensor ends that particular data stream, two other key science instruments remain active, continuing to send back valuable information from interstellar space. NASA is now exploring even stricter power-saving measures to extend the mission as long as possible. This latest shutdown is expected to buy Voyager 1 at least one more year of operation, allowing humanity’s farthest-reaching explorer to keep sending data from the edge of the solar system and beyond. The spacecraft may be fading, but its journey is far from over.