# NASA Shuts Down Voyager 1 Instrument to Extend Interstellar Mission
NASA engineers have forcibly powered down one of the last operating scientific instruments aboard Voyager 1—the Low-Energy Charged Particle (LECP) experiment. This decision will extend the spacecraft's operations by roughly another year, despite critically low power levels. The mission, which began in 1977, continues transmitting unique data from interstellar space, where the spacecraft has been since 2012.
Power Crisis Aboard the Oldest Space Probe
Voyager 1 is powered by three radioisotope thermoelectric generators (RTGs), which convert heat from plutonium-238 decay into electricity. Since launch, the power output from these sources has steadily declined—about 4 watts per year. By 2026, available power will drop to levels insufficient for running all systems simultaneously. In February 2026, a sudden voltage dip nearly triggered the spacecraft's safe mode, which would have taken months to recover communications and functionality.
To avoid such risks, the project team at the Jet Propulsion Laboratory (JPL) opted to follow a pre-approved instrument shutdown schedule. LECP was the latest casualty of this plan—its counterpart on Voyager 2 was deactivated back in March 2025.
Scientific Legacy of LECP and Current Capabilities
The LECP experiment played a pivotal role in studying the heliosphere boundary—the region influenced by the solar wind. It detected flows of ions, electrons, and galactic cosmic rays, enabling scientists to precisely identify the moment Voyager 1 entered interstellar space. LECP data formed the foundation for maps of interstellar medium structure that no other instrument can provide.
After LECP shutdown on Voyager 1, only two active scientific instruments remain:
- Plasma Wave Detector (PWS)—tracks fluctuations in plasma density in the interstellar medium;
- Magnetometer (MAG)—measures the direction and strength of magnetic fields beyond the heliosphere.
These instruments continue delivering invaluable data on physical conditions in interstellar space, despite the spacecraft's age and power constraints.
Mission Extension Strategy: Engineering Trade-offs
The JPL team is using a multi-tiered approach to manage Voyager 1's resources:
- Gradual instrument shutdowns in order of scientific priority, set in the 2010s.
- Power redistribution among remaining systems, including heater toggling and adjustments to onboard computer modes.
- Telemetry optimization—cutting data volume without losing key scientific info.
- Ground infrastructure upgrades, such as more sensitive antennas in the Deep Space Network for receiving faint signals.
These steps maintain contact with the spacecraft, now over 24 billion kilometers from Earth, where radio signals take more than 22 hours one way.
Key Takeaways
- Shutting down LECP will extend Voyager 1 operations by about one year.
- The spacecraft remains the sole source of in situ data from interstellar space.
- RTG power drops ~4 W per year; by 2027, it may not cover even basic systems.
- All shutdown decisions follow a long-term plan approved by the scientific community.
- Voyager 2 is on a similar path and likely to stop transmitting data in 2027–2028.
The Voyager mission remains one of the longest-running and most productive endeavors in space exploration history. Its technical legacy shapes the design of modern interplanetary probes, including power management and fault tolerance systems. Even in its twilight phase, the mission keeps refining our grasp of the Solar System's edges and what lies beyond.
— Editorial Team
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