MAVEN loss – NASA has declared the end of the MAVEN Mars orbiter’s mission after the spacecraft stopped responding following a normally scheduled occultation behind Mars on December 6, 2025. With the Deep Space Network unable to detect a signal and repeated blind commands
On December 6. 2025. MAVEN was doing what it was built to do: pass behind Mars and keep working through routine geometry—while studying how the solar wind shapes the Martian atmosphere. For most of that moment, NASA says, everything looked normal. Then, during a 20- to 30-minute period out of contact with Earth, something changed. When MAVEN emerged, the Deep Space Network did not detect a signal. After months of effort, NASA has now concluded it cannot be recovered.
“Our last successful communication with MAVEN occurred on December 6 of 2025. ” said Mike Moreau. MAVEN project manager at NASA’s Goddard Space Flight Center in Maryland. “The MAVEN spacecraft and all of the subsystems were nominal when the spacecraft entered a normally scheduled occultation where the spacecraft passed behind Mars.”.
NASA officials said that on Wednesday. after concerted efforts to remotely reset the spacecraft’s computer and prompt the probe to “phone home. ” they were unable to restore contact. “There were no indications of problems with the spacecraft in the week prior to the loss of signal,” Moreau said. “But when the spacecraft emerged behind Mars on December 6, the Deep Space Network did not detect a signal.”.
In the days that followed the blackout. commands were sent in the blind—attempts to force MAVEN’s flight computer to restart—but to no avail. “Unfortunately. all of these efforts to reestablish communication with MAVEN were ultimately unsuccessful. and no telemetry or signal has been received from the spacecraft since December 6. ” Moreau said.
Launched on Nov. 18, 2013, MAVEN—an acronym standing for the Mars Atmosphere and Volatile Evolution Mission—braked into orbit around Mars the following September. It was equipped with a suite of instruments designed to study how Mars’ atmosphere is eroded by charged particles from the solar wind. Originally planned for one year. the mission was repeatedly extended. becoming the most extensive research program on the Martian atmosphere ever attempted.
The science mission also became a kind of bridge for the rest of Mars exploration. Along with studying the red planet’s atmosphere. MAVEN helped relay signals from NASA’s two operational Mars rovers. Curiosity and Perseverance. to flight controllers at the Jet Propulsion Laboratory. Three other Mars orbiters provide similar communications relay service.
NASA says the probe’s discoveries helped reshape how scientists think about a planet that was once warmer and wetter. For water to exist on Mars’ surface, a much higher atmospheric pressure is required than what exists today. MAVEN provided major insights into how charged particles in the solar wind have eroded Mars’ atmosphere over billions of years.
One of those findings came from years of accumulated data. Shannon Curry, the principal investigator at the University of Colorado at Boulder, described an observation that used 11 years of MAVEN data to detect, for the first time in any planet, an atmospheric escape process called “sputtering.”
“This is where charged particles crash into the upper atmosphere and splash out the neutral atmosphere. much like doing a cannonball in a pool. ” Curry said. “Our team (confirmed) that this process has been a dominant escape mechanism for billions of years. which has incredible implications for other planets in our solar system and even exoplanets.”.
Curry’s words carry a specific kind of pride—because this wasn’t just a mission that returned data. It was a mission that kept returning answers, and then kept going. Now, NASA is working to understand what went wrong, not only for closure, but for lessons that could matter to other spacecraft.
Since the loss, the agency has been investigating the cause. In February, NASA set up an anomaly review board to look for the root cause. As part of that review. engineers re-analyzed recordings of what the Deep Space Network possibly could have “heard” when MAVEN emerged from behind Mars as part of an ongoing radio science experiment.
Normal telemetry wasn’t there—exactly as expected—but fragments of data pointed to an alarming detail: the spacecraft was rotating at 2.7 revolutions per minute. MAVEN did not normally rotate in that way. Other than periodically changing its orientation to support science observations. communications. and power generation. the probe kept its solar panels aimed toward the sun and its antenna pointed toward Earth.
At the observed rotation rate, NASA says, normal communications likely would not have been possible, and the arrays would have been unable to generate sufficient power. In that scenario, MAVEN’s batteries would have drained quickly.
Moreau would not speculate on what might have happened while the spacecraft was out of contact with Earth, saying he was eager to hear the results of the ongoing investigation.
Whatever the cause, NASA concludes the rotation rate observed in the recovered telemetry was not survivable. MAVEN is expected to remain in the same orbit around Mars for at least the next 50 to 100 years, but NASA will make no additional attempts to regain contact.
Curry, reflecting on what the mission meant to the people who built and operated it, put it plainly. “On a personal note, leading this team has been a privilege and an honor,” she said. “This team has worked tirelessly on operating the spacecraft and delivering exceptional science. It’s their vision, their drive and their curiosity that brought these amazing discoveries into fruition. I will miss the spacecraft and this team dearly.”.
When asked what should go on MAVEN’s tombstone, Curry answered in a line that sounded like both a tribute and a verdict. “Best Mars mission ever.”
Behind the hard stop in December 2025 is a reminder of why MAVEN mattered: it spent years listening to the thin air around Mars. helping explain how that atmosphere can be stripped away by forces from the Sun. Now it is silent—officially out of reach—but its data. including the 11-year evidence for sputtering as a dominant escape mechanism. will continue to work in the science world for a long time.
NASA MAVEN Mars Atmosphere and Volatile Evolution Mission Mars rovers Curiosity Perseverance solar wind sputtering atmospheric escape Deep Space Network anomaly review board spacecraft communications