The Voyager probes are maybe in their final years of interstellar exploration. NASA’s Voyager 1 and Voyager 2, launched in 1977, were initially set to study the giant planets of our solar system. Now, they’ve well exceeded their expected lifespan and are still sending back valuable data from deep space, even as their power sources dwindle. They are currently operating on just 470 watts of energy, a mere fraction of what they originally produced.
In 2012, Voyager 1 entered interstellar space, followed by Voyager 2 in 2018. Over the years, NASA has been carefully shutting down various instruments as power fades. The spacecraft lose about four watts of power each year. To tackle this challenge, NASA’s Jet Propulsion Laboratory (JPL) has a plan: an engineering maneuver, dubbed the “Big Bang,” set for 2026. If successful, this may extend the missions’ lives by allowing the team to turn off devices that prevent the spacecraft’s fuel lines from freezing and activate others that use less power.
As of now, Voyager 1 has only two operational instruments left, while Voyager 2 runs three. Both are running low on power but still functioning. The good news is that mission managers are optimistic about gaining more time. They aim to delay shutting down science instruments and keep the probes working a bit longer.
Experts believe that Voyager’s longevity is astonishing. Suzanne Dodd, the project manager at JPL, mentioned that the spacecraft could continue to surprise us with new discoveries. As they head farther from Earth, their observations might offer insights into areas we have never studied before. In a 2022 statement, Dodd noted that the probes might reach the 2030s if they can keep some instruments working below operational thresholds.
Interestingly, the Voyager probes utilize nuclear power, which provides a consistent energy source. However, every system onboard is aging. Alan Cummings, a co-investigator on the mission, pointed out that while the probes will never run out of nuclear power entirely, the energy available for operation is diminishing. He observed that the spacecraft might only have around 230 watts left, much of which is consumed by their transmitting equipment.
The Voyager spacecraft have faced various challenges over time. Deep space radiation has impacted their instruments, and the thruster lines that keep them functioning are at risk of freezing. Despite these hurdles, the redundancy built into the Voyager missions has allowed them to persist longer than anyone anticipated.
Looking ahead, mission managers hope that the probes will make it to their 50th anniversary in 2027, which seems likely based on current performance. They eventually aspire for the Voyagers to reach about 200 astronomical units from Earth by 2035. Although this goal requires good luck and engineering, nothing seems impossible for these remarkable spacecraft, which have continued to defy expectations for decades.
For more detailed insights, you can read about the Voyager Program by NASA.
