Inside NASA’s ‘Big Bang’ Power-Saving Operation

NASA engineers have completed a targeted power-saving operation on Voyager 2, a spacecraft that has been travelling through space since 1977. The procedure, nicknamed the “Big Bang” by the mission team at NASA’s Jet Propulsion Laboratory, switched off selected power-hungry components and moved others to lower-energy configurations, while keeping the vehicle warm enough for its scientific work to continue.

Voyager 2 depends on radioisotope thermoelectric generators that convert heat from decaying plutonium into electricity. Because the plutonium supply declines steadily, the spacecraft loses roughly 4 watts of usable power every year. After almost 50 years in deep space, that slow decay has left mission controllers with very little margin: they have already turned off systems no longer considered essential and, since 2024, have shut down two of Voyager 2’s science instruments.

Without the “Big Bang” effort, the team says another instrument would have had to be switched off before the end of 2026. The power that was freed through the swap is expected to keep Voyager 2’s three remaining instruments running for at least one additional year.

NASA plans to perform the same power-saving change on Voyager 1, which is farther from Earth than Voyager 2, and expects to finish that work in the coming months.

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Why Voyager 2’s Power Crisis Keeps Tightening

Why the Power Loss Keeps Tightening

The core constraint is physical, not a fault: the radioisotope thermoelectric generators produce less electricity as their plutonium fuel decays. The stated loss of about 4 watts per year may sound small, but it compounds over decades. Each scientific instrument and heater is a real draw, so a spacecraft that once ran 10 instruments now has to ration power for only a few.

What the “Big Bang” Swap Actually Changed

The operation did not add new energy; it freed existing electricity by turning off certain hardware and switching to lower-power alternatives. NASA’s statement that the change should preserve the remaining three instruments for at least one extra year is an informed estimate based on known power consumption, not a permanent fix. The gain is meaningful because it delays the next forced shutdown without compromising the spacecraft’s temperature, which is essential for its instruments to keep functioning in deep space.

What the Same Move on Voyager 1 May Show

NASA’s plan to repeat the procedure on Voyager 1 in the coming months suggests the engineering team sees the approach as reliable enough to standardize across the twin probes. Because Voyager 1 is farther from Earth, the operational details and communication timing differ, but the underlying power management logic is the same.