A world that might have been habitable became barren and cold
For eleven years, a quiet sentinel named MAVEN circled Mars and read the planet's ancient autobiography — a story of atmospheric loss, vanished oceans, and a world undone by solar wind over billions of years. In December, the spacecraft fell silent, and NASA has now formally acknowledged what engineers could not reverse. MAVEN's end is not merely the retirement of a machine; it is the closing of a particular window through which humanity glimpsed both Mars as it was and, perhaps, Earth as it might one day become.
- MAVEN went silent in December after more than eleven years of continuous operation, and months of recovery attempts by engineers failed to restore any contact.
- The loss disrupts an active communications relay that had been helping Curiosity and Perseverance send data back to Earth, creating a gap in NASA's Mars Relay Network.
- Scientists are working to preserve and archive MAVEN's decade-long dataset, ensuring its measurements of atmospheric erosion and Martian auroras remain accessible for future research.
- NASA is now translating MAVEN's radiation and atmospheric data into concrete safety protocols for the human Mars missions planned in the coming decades.
On Wednesday, NASA officially ended the MAVEN mission, closing an eleven-year chapter in Mars exploration after the spacecraft fell silent in December and all recovery efforts failed. Launched in November 2013 aboard an Atlas V rocket, MAVEN entered Martian orbit in September 2014 and was designed to operate for a single year. It lasted more than a decade.
What MAVEN uncovered was a planetary tragedy written in deep time. Early Mars had a thicker atmosphere, warmer temperatures, and liquid water — conditions that might have nurtured life. Over billions of years, the solar wind steadily stripped that atmosphere away, a process MAVEN measured with unprecedented precision. Intense solar storms, the data showed, dramatically accelerated the erosion, leaving behind the frozen desert we observe today.
The mission also documented Martian auroras — shimmering displays that, unlike Earth's, spread across much of the planet's surface rather than concentrating at the poles. During a planet-wide dust storm in 2018, MAVEN confirmed that such events push water vapor high into the atmosphere, where it escapes into space, helping explain how Mars lost its water. In one of its final acts, the spacecraft photographed 3I/ATLAS, only the third interstellar object ever detected passing through the solar system.
Principal investigator Shannon Curry reflected on a mission that consistently exceeded expectations, while NASA's Louise Prockter pointed toward its lasting practical value: MAVEN's atmospheric and radiation data will directly shape safety protocols for future human missions to Mars. The spacecraft's orbit will slowly decay, its instruments forever dark — but its archives remain, ready to answer questions scientists have not yet thought to ask.
On Wednesday, NASA officially closed the book on MAVEN, an orbiting observatory that spent more than eleven years circling Mars and fundamentally changing how scientists understand the planet's past. The spacecraft fell silent in December, and despite months of recovery attempts, engineers could not restore contact. MAVEN — the acronym stands for Mars Atmosphere and Volatile Evolution — will transmit no more data, conduct no more observations. It is gone.
The mission began on November 18, 2013, when an Atlas V rocket lifted off from Cape Canaveral carrying the spacecraft toward the Red Planet. Nine months later, in September 2014, MAVEN entered Mars orbit and began its work. NASA had designed it for a single year of operation. Instead, it ran for more than a decade, far outlasting its original blueprint and accumulating a body of discoveries that reshaped planetary science.
What MAVEN revealed was a story of planetary loss written across billions of years. Mars was not always the frozen desert we see today. Early in its history, the planet possessed a thicker atmosphere, warmer temperatures, and liquid water on its surface — conditions that might have supported life. But over eons, the solar wind — a constant stream of charged particles flowing from the sun — gradually stripped away the Martian atmosphere, layer by layer. MAVEN's instruments measured this process with unprecedented precision, showing how space weather accelerated the erosion, particularly during intense solar storms. The planet that might have been habitable became barren and cold.
Among MAVEN's most striking discoveries were Martian auroras, the shimmering light displays that occur when charged particles collide with atmospheric gases. Earth's auroras concentrate near the poles, but Mars produces them across much of its surface, a phenomenon MAVEN documented and studied in detail. The spacecraft also observed a planet-wide dust storm in 2018, confirming that such cataclysmic weather events can push water vapor higher into the atmosphere and accelerate its escape into space — another mechanism by which Mars lost its water.
One of MAVEN's final acts, before contact was lost, was to photograph 3I/ATLAS, the third interstellar object ever discovered passing through the solar system. It was a fitting capstone to a mission that had consistently delivered surprises.
Shannon Curry, the mission's principal investigator at the University of Colorado Boulder, reflected on the work: the science team took pride in the discoveries, in the way MAVEN had advanced understanding of how planetary atmospheres evolve and vanish. Louise Prockter, director of NASA's Planetary Science Division, emphasized a more immediate consequence: the data MAVEN collected will inform decisions about radiation shielding and safety protocols for the humans NASA plans to send to Mars in coming decades. The mission also served a practical role in the present, relaying communications from rovers like Curiosity and Perseverance back to Earth through NASA's Mars Relay Network.
Now MAVEN is silent, its instruments dark, its orbit slowly decaying. But the work it did — the measurements it took, the questions it answered — will echo through Mars science and human exploration for decades. The data sits in archives, waiting to be analyzed, reanalyzed, and applied to problems scientists have not yet imagined. MAVEN may be gone, but what it learned about Mars remains.
Citações Notáveis
The MAVEN mission has truly advanced our understanding of the Martian atmosphere and evolution. Our science team is exceptionally proud of all of these amazing discoveries.— Shannon Curry, MAVEN principal investigator, University of Colorado Boulder
The science MAVEN has given us is key to informing what kind of radiation protection and safety measures we must take before sending humans to Mars.— Louise Prockter, director of NASA's Planetary Science Division
A Conversa do Hearth Outra perspectiva sobre a história
Why does it matter that we understand how Mars lost its atmosphere? It's already gone.
Because it tells us what happened to a world that might have been habitable. If we understand the mechanism — how solar wind strips away an atmosphere over time — we can recognize when it's happening elsewhere, and we can prepare for it.
Prepare for it how?
If we're sending humans to Mars, we need to know what radiation they'll face, what the atmospheric conditions really are. MAVEN's data tells us how much protection we need to build into habitats and spacesuits. It's the difference between a mission that works and one that fails.
So this is about Mars' past informing our future there.
Exactly. MAVEN spent eleven years reading Mars' biography. Now we use that biography to write our own story on the planet.
What was the most surprising thing MAVEN found?
The auroras, maybe. We didn't expect them to be so widespread, so different from Earth's. It showed us Mars is still dynamic in ways we didn't fully appreciate — even as a dead world, it has phenomena worth studying.
And now the spacecraft itself is dead.
Yes. But the knowledge it gathered — that's permanent. That's what survives.