Voyager 2 is nearly 50 years old, losing about 4 watts of power every year as its plutonium power source fades — and NASA just bought it at least another year of science with an all-at-once power-system swap engineers called the “Big Bang,” performed on a spacecraft with razor-thin power margins and no possibility of physical repair.
Voyager 1 was launched in 1977 with a suite of 10 science instruments — as of 2026, only two remain switched on, and the spacecraft's nuclear power source loses roughly 4 watts every year, a slow drain that is now deciding what humanity still gets to learn from interstellar space