The high price of exploring our solar system's edge

Space · Published 24 October 2026 Swipe more like this →

In short: Voyager 1 is currently navigating a cosmic void no human-made object has ever reached. But to keep this historic probe alive nearly 50 years after launch, NASA must make difficult sacrifices, systematically silencing its own instruments to prevent the spacecraft from falling into a permanent, frozen sleep.

To reach the interstellar medium, Voyager 1 had to cross the heliopause—the boundary where the Sun's influence yields to the galaxy. Since entering this region in August 2012, it has become our primary window into the deep void. However, maintaining a presence there is an engineering battle against entropy. The spacecraft relies on radioisotope thermoelectric generators that convert heat from decaying plutonium into electricity. Because of this decay, Voyager 1 loses approximately 4 watts of power every single year.

The Low-energy Charged Particles experiment (LECP) was deactivated by NASA's Jet Propulsion Laboratory (JPL) technicians during April 17. This instrument had operated almost continuously since 1977, providing critical data on ions, electrons, and cosmic rays. The decision was a preemptive strike against an undervoltage fault protection system; after an unexpected power drop during a roll maneuver on February 27, engineers realized they had to act quickly to prevent the probe from automatically shutting down its own vital components.

The mission is now in a state of managed decline. While the LECP is silent, two instruments remain active: one listening to plasma waves and another measuring magnetic fields. These continue to transmit unique data from beyond our solar system. The goal for JPL is a delicate balancing act—shutting off heaters and non-essential science tools just enough to keep the fuel lines from freezing while preserving the core mission of exploring the interstellar medium.

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