Power-Swap “Big Bang” Extends Voyager 2’s Science Life

Engineers at NASA’s Jet Propulsion Laboratory (JPL) recently reconfigured Voyager 2’s power-distribution and thermal-control systems in an operation nicknamed the “Big Bang.” By turning off an obsolete digital tape recorder and two heaters while powering a different heater and a propulsion instrument, the team reduced the spacecraft’s electrical draw by roughly 10 watts. NASA says the saving should keep Voyager 2’s three remaining science instruments operating for at least an extra year.

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-syst

Voyager 2 launched on August 20, 1977 with three radioisotope thermoelectric generators (RTGs). These generators convert heat from the natural decay of plutonium-238 into electricity, a process that requires no moving parts and works without sunlight. Over nearly five decades, each Voyager has lost about four watts of power per year as the plutonium decays and the thermoelectric converters age. Early in the mission, abundant power allowed cameras and other planetary-encounter instruments to operate; later, those devices were retired and heaters were cycled off to conserve energy. By the mid-2020s, a loss of only a few watts could determine whether a remaining instrument survived.

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-syst

• Current distance: Voyager 2 is roughly 143 astronomical units from Earth, making round-trip radio communication take about 19 hours each way.

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-syst

• Power decline: Approximately four watts per year are lost from the RTGs.

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-syst

• Savings achieved: The “Big Bang” reconfiguration freed almost 10 watts, equivalent to roughly two and a half years of the normal annual decline.

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-syst

• Remaining instruments: Magnetometer, plasma-wave subsystem, and cosmic-ray subsystem—all still functional after the swap.

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-syst

The agency also notes that the same reconfiguration is planned for Voyager 1 in the coming months, though it cautions that success on one probe does not guarantee identical results on its sibling because of differing thermal histories.

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-syst

NASA’s statement is more conservative, promising “at least an extra year.” Both assessments are technically compatible: the power reduction equals roughly 2.5 years of the typical four-watt annual loss, but actual mission duration also depends on heater duty cycles, component aging, and unforeseen faults. No public timeline has been given for when the next instrument might be retired, and the precise health of remaining subsystems remains undisclosed.

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-syst

The JPL team intends to apply the same power-swap strategy to Voyager 1 later this year. NASA has indicated that, if the spacecraft remain healthy, at least one science instrument could continue operating into the 2030s. Continued monitoring will determine whether further power-budget adjustments become necessary as the probes travel deeper into interstellar space.

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-syst