Nasa’s Voyager 1 and Voyager 2 spacecraft, now nearly 50 years into their adventure, are running low on power. However, a bold engineering plan could keep them exploring interstellar space into the 2030s, bringing us more scientific insights.
The Voyager probes have far outlasted their expected lifespan. Initially built for a short mission, they were designed to explore the outer planets of our solar system. Today, they continue to send valuable data back to Earth, even from deep space. But as they drift farther away, their power source is dwindling.
To tackle this challenge, NASA is gearing up for a high-risk operation dubbed the “Big Bang.” This involves turning off three devices that prevent fuel lines from freezing and replacing them with more efficient units. This switch could save nearly 10 watts of power, which is crucial for keeping scientific instruments running. If successful, it could delay shutting down important equipment by a year.
Every year, both spacecraft lose about four watts of power, leaving them with barely enough to function. In 2022, mission manager Suzanne Dodd noted they had only five to six watts of spare energy, just enough to keep systems operational. The most power-hungry system, the transmitter, uses around 200 watts alone.
Social media buzz around the Voyager missions highlights their unique journey. The probes used a rare planetary alignment for gravity assists, making their explorations much more efficient. This alignement happens roughly every 176 years, making their mission even more remarkable.
Even with the looming threat of power depletion, NASA continues to shut down instruments slowly, balancing energy conservation with the desire to gather data. Currently, some systems, like the cosmic ray detectors, have been powered down, while others, including plasma wave subsystems, remain active.
Despite the challenges, experts remain hopeful. Alan Cummings, a co-investigator on the Voyager mission, explained that while the nuclear power won’t entirely run out, the spacecraft will eventually lack enough power to operate all systems. However, Dodd expressed an optimistic view: “If we get really lucky, maybe we can stretch things out into the 2030s.”
The team’s stretch goal is to have each spacecraft reach 200 astronomical units (AU) from Earth by 2035, a milestone that seems ambitious but achievable. Currently, Voyager 1 is at 169.8 AU, and Voyager 2 is at 143.1 AU.
With continued ingenuity and a bit of luck, the Voyager missions may prove to exceed even these lofty expectations, continuing to unveil the mysteries of our universe long after they were scheduled to retire.
