Could Voyager 2 Be One of Humanity’s Greatest Discoveries?
A Race Against Time: Can Voyager 2 Keep Going?
NASA is making difficult choices to extend Voyager 2’s mission, shutting down another scientific instrument to conserve power. In October 2024, the Plasma Spectrometer was powered down, and on March 24, 2025, the Low-Energy Charged Particle Instrument (LECP) will follow.
What does this mean for one of humanity’s most enduring spacecraft? How much longer can Voyager 2 continue its groundbreaking exploration?
“If we don’t turn off an instrument on each Voyager now, they would probably have only a few more months of power before we would need to declare end of mission,” said Suzanne Dodd, Voyager Project Manager at JPL.
From a Five-Year Mission to 50 Years in Deep Space
Voyager 1 and 2 launched in 1977 with a mission designed to last only five years. Decades later, they have surpassed all expectations, reaching interstellar space and becoming our longest-operating space explorers.
Their power source, plutonium-238, is steadily decaying, reducing the energy available to operate onboard systems. To keep critical instruments running, NASA has been selectively shutting down systems that provide diminishing scientific returns. Now, even once-crucial instruments like the LECP must be sacrificed to keep Voyager 2 alive.
The Last Three: What Voyager 2 Can Still Detect
As Voyager 2 bids farewell to the LECP, only three instruments remain active:
Triaxial Fluxgate Magnetometer (MAG): Continues to measure interstellar magnetic fields and their interaction with the Sun’s magnetic influence.
Cosmic Ray Subsystem (CRS): Helps analyze cosmic ray composition, offering insight into the interstellar medium (ISM) and the fundamental makeup of our galaxy.
Plasma Wave Subsystem (PWS): Measures interstellar plasma density, revealing the structure and behavior of space beyond the heliosphere.
Despite losing the LECP, these three instruments will still send back invaluable data as Voyager 2 ventures deeper into the unknown.
LECP’s Final Contribution: A Legacy of Discovery
The LECP has played a pivotal role in studying charged particles, solar wind interactions, and the heliopause—the boundary where our Sun’s influence ends and interstellar space begins. Remarkably, its rotating motor, originally tested for 500,000 steps, has exceeded 8.5 million steps over 50 years of continuous operation.
This instrument isn’t failing; it’s being shut down to conserve energy.
Its principal investigator, Stamatios Krimigis—now 86 and retired—has witnessed its entire lifespan. The shutdown of the LECP marks the end of an era, but not the end of discovery.
Voyager 1 and 2: Humanity’s First Interstellar Messengers
The Voyagers were never intended to leave the solar system, yet they became the first interstellar probes. Having traveled over 20 billion kilometers, their signals take nearly a full day to reach Earth. Their longevity is a testament to human curiosity, engineering, and ambition.
“The Voyager spacecraft have far surpassed their original mission to study the outer planets,” said Patrick Koehn, Voyager Program Scientist at NASA. “Every bit of additional data we have gathered since then is valuable bonus science.”
How Long Can the Voyagers Keep Going?
NASA expects that by 2026, Voyager 2 will lose its CRS instrument, leaving it with just two operational instruments. Both Voyager 1 and 2 are projected to continue operating into the 2030s, but their days are numbered. The deep space environment is harsh, and inevitable failures loom on the horizon.
Will they still be sending data on their 60th anniversary? Or will their final signal come sooner than expected?
The Final Years: Every Day Could Be the Last
Each day could mark the Voyagers’ last transmission, yet each day could also bring a new interstellar revelation. NASA is doing everything possible to keep them running for as long as possible.
“Every minute of every day, the Voyagers explore a region where no spacecraft has gone before,” said Linda Spilker, Voyager Project Scientist at JPL. “That also means every day could be our last. But that day could also bring another interstellar discovery.”
With each passing hour, the Voyagers drift further from home, carrying humanity’s message to the stars. The end is near—but not yet.
Source: Could Voyager 2 Be One of Humanity’s Greatest Discoveries?
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