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NASA Faces A Critical Challenge! After Nearly 50 Years, The Iconic Voyager 1 And 2 Probes Are Running Out Of Power, Forcing Drastic Cuts To Keep Them Alive.
The Voyager 1 and Voyager 2 probes, launched by NASA in 1977, are in a race against time.
With more than four decades of mission, these two spacecraft are facing a critical problem: the shortage of plutonium, the power source that fuels their generators.
This fact puts the future of these probes at risk, which represent historic milestones in space exploration.
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In a desperate move to extend their usable lives, NASA has begun shutting down essential instruments and taking drastic measures to try to keep these probes operational for a few more years.
On February 25, 2025, NASA announced that it had deactivated one of the key instruments on Voyager 1, the cosmic ray subsystem.
This equipment, responsible for studying high-energy particles in interstellar space, was one of the last to function on the probe, which is currently over 23 billion kilometers from Earth.
The decision to shut it down was made due to the decline in power of the probe, which now relies solely on energy generated by a small radioisotope generator, whose fuel (plutonium) is running out.
Voyager 1, which holds the title of the farthest human-made object from Earth, achieved a remarkable feat by detecting, in 2020, for the first time, how solar electrons accelerate when bouncing off shock waves as they travel outward from the solar system.
This discovery was a milestone for understanding the behavior of solar wind, one of the great unknowns in astrophysics.
However, with the end of plutonium approaching, NASA has had to make difficult decisions to preserve what remains of the mission.
The Fight For Voyager Probes’ Survival
For Voyager 2, another iconic probe, the same fate awaits.
NASA plans to shut down, on March 24, 2025, the instrument that measures low-energy charged particles.
Although this measure is painful, it is seen as necessary to ensure that the other instruments on the probe can continue to operate, albeit in a limited manner.
The Voyager probes, in their original mission, were designed to explore the giant planets Jupiter and Saturn.
But, as a result of the success of these missions, they have been kept operational for over 40 years, making discoveries that exceeded the expectations of their engineers and scientists.
However, there is a significant challenge to be faced: the fuel that keeps these instruments functioning, plutonium, depletes each year.
Every 12 months, the probes lose about 4 watts of power, and over time, the equipment stops functioning.
This results in an ever-decreasing number of operational instruments on both probes.
Currently, of the 10 scientific tools that were aboard the Voyagers, only three remain operational.
On each of the probes, these instruments are vital for continuing to collect data from interstellar space.
For Voyager 1, the only functional instrument will be the magnetometer, which measures the magnetic field in the outer regions of the solar system.
As for Voyager 2, it still has the cosmic ray subsystem, which is expected to continue operating until 2026.
However, the situation is dramatic: the future of the mission depends on the ability to control energy consumption, even with increasingly evident limitations.
Instruments in Extinction: The End of the Voyager Probes Era
With the approach of the definitive failure of the plutonium generators, NASA has adopted an “energy-saving” strategy.
To ensure that the work of both probes does not come to an untimely end, the space agency has been progressively shutting down various instruments and systems.
In 2024, Voyager 1 experienced a significant failure in its internal memory, resulting in six months of complete silence.
However, thanks to a bold software update, NASA’s team managed to restore communication with the probe, allowing it to resume data transmission.
Nonetheless, not all failures have been resolved easily.
In September 2024, it was necessary to activate the secondary thrusters of Voyager 1 to correct its orientation after a blockage in the main engines, resulting from the aging systems of the probe.
Although this action was risky and challenging, the success of the procedure ensured that the mission could continue, at least for a little while longer.
The engineering behind the Voyager missions, which already seems like a story of overcoming and perseverance, continues to write surprising chapters.
Mission Until 2030: Hope Until The End
According to Suzanne Dodd, Voyager project manager, NASA expects that the probes will still be able to operate until at least 2030.
However, this horizon is far from guaranteed.
With fewer and fewer instruments operational, the probe will gradually lose the ability to transmit scientific data effectively.
Even so, NASA bets on the constant modifications and adjustments made to the probes to extend the operational time of the probes as much as possible.
In addition to their original mission to explore Jupiter and Saturn, the Voyagers have played a fundamental role in collecting information about the heliopause — the region where solar wind loses its influence and gives way to the environment of interstellar space.
This area represents one of the most unknown fronts in astrophysics, and the probes have been, to this day, the only instruments capable of providing reliable data about this region of space.
The last major contribution of the probes was the transmission of information about the interaction between the Sun’s magnetic field and interstellar space, helping the scientific community to better understand the behavior of solar wind, cosmic particles, and magnetic fields in distant regions of our solar system.
The maintenance of these probes, even with increasingly limited resources, has been one of NASA’s greatest victories in space engineering.
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