Topic: Space

NASA engineers shut down an instrument on Voyager 1 to save power and extend its life. The spacecraft is losing power due to age.

Voyager 1, a spacecraft that has been exploring space for nearly 49 years, is facing a power crisis. To keep it alive, NASA engineers decided to shut down one of its instruments, the Low-energy Charged Particles experiment (LECP). This instrument had been operating almost continuously since Voyager 1 launched in 1977.

The LECP studied low-energy charged particles like ions, electrons, and cosmic rays that come from both our solar system and the wider galaxy. It has delivered valuable insights into the interstellar medium, including detecting pressure waves and changes in particle density beyond the heliosphere.

Voyager 1 is powered by a radioisotope thermoelectric generator that converts heat from decaying plutonium into electricity. As it ages, the spacecraft loses about 4 watts of power every year. With available power becoming extremely limited, engineers must carefully reduce energy use to prevent the spacecraft from freezing.

The decision to shut down the LECP was not made suddenly. Years earlier, scientists and engineers developed a step-by-step plan for shutting down systems in a specific order while preserving as much scientific capability as possible. The same instrument was shut down on Voyager 2 in March 2025.

One small part of the LECP will continue operating. A motor that rotates the sensor to scan in all directions remains active because it uses very little power (0.5 watts). This increases the possibility that the instrument could be restarted in the future if enough power becomes available.

Engineers expect that turning off the LECP will provide Voyager 1 with about one additional year of operation. During this time, the team is preparing a more advanced power-saving strategy known as 'the Big Bang.' This approach involves replacing several power-consuming components at once with more efficient alternatives to maintain enough warmth and functionality for continued science operations.

The Big Bang will first be tested on Voyager 2, which has slightly more available power and is closer to Earth, making it a lower-risk candidate. Tests are scheduled for later this year.

Why It Matters

This story matters because it shows how scientists work together to extend the life of important spacecraft like Voyager 1, which continue to explore space and provide valuable data for us to learn from.

Key Facts

• Voyager 1 is a spacecraft that has been exploring space for nearly 49 years.
• The LECP instrument was shut down to save power and extend the life of the spacecraft.
• Voyager 1 loses about 4 watts of power every year due to aging.
• Engineers are preparing a more advanced power-saving strategy called 'the Big Bang' to maintain enough warmth and functionality for continued science operations.
• The Big Bang will first be tested on Voyager 2, which has slightly more available power and is closer to Earth.

Key Terms

Radioisotope thermoelectric generator

A device that converts heat from decaying plutonium into electricity.

Implications

This story matters because it shows how scientists work together to extend the life of important spacecraft like Voyager 1, which continue to explore space and provide valuable data for us to learn from.