NASA’s Voyager 1 and 2 spacecraft, launched in 1977, have been traveling through space for over 44 years. The probes were initially designed to study the outer planets, but they have since ventured into interstellar space, a vast region beyond our solar system.
The spacecraft rely on radioisotope thermoelectric generators (RTGs) powered by decaying plutonium-238 isotopes. However, their onboard power source is almost depleted, causing scientists to shut down scientific instruments one by one.
Voyager 1 and 2 have struggled with low power levels in the past, including a recent communication blackout that was resolved after engineers switched its thrusters to conserve energy. Despite these efforts, the probes’ dwindling plutonium reserves mean their lifespan is limited.
The mission team is still hopeful for the spacecraft’s survival until their 50th anniversary in space, just over two years away. NASA officials have expressed relief and appreciation for the groundbreaking mission that has allowed both probes to reach a historic milestone: escaping the heliopause, the boundary of our solar system.
Source: https://www.yahoo.com/news/voyager-probes-dying-181029555.html