NASA Says an “Anomaly” Has Led to Sudden Signal Loss with One of Its Spacecraft Orbiting Mars

Micah Hanks·

NASA anomaly MAVEN

Welcome to this edition of The Intelligence Brief… This week, NASA is facing an unexpected communications blackout with one of its key Mars orbiters, after the MAVEN spacecraft abruptly fell silent following an unexplained anomaly on December 6. In our analysis, we’ll look at: 1) what NASA has revealed so far about the sudden signal loss, 2) why MAVEN is critical to both Mars atmospheric science and rover communications, 3) how past deep-space missions like Voyager help frame possible causes behind the anomaly, and 4) what the outage could mean for ongoing Mars exploration as engineers race to reestablish contact.

Quote of the Week

“The spacecraft and operations teams are investigating the anomaly to address the situation.” 

– Erin Morton, NASA Planetary Science Communications

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RECENT NEWS from The Debrief

MAVEN Goes Mum After Experiencing an “Anomaly”

Houston, we have a problem: this week, NASA revealed that one of its spacecraft currently in orbit around Mars has inexplicably gone incommunicado.

According to the American space agency, the latest Martian mystery began to unfold on December 6, 2025, as its Mars Atmosphere and Volatile EvolutioN (MAVEN) spacecraft reappeared after its orbital path carried it behind the Red Planet.

“Telemetry from MAVEN had showed all subsystems working normally before it orbited behind the Red Planet,” read a NASA statement issued on Monday. However, once MAVEN came out from behind Mars again, something unexpected happened.

“After the spacecraft emerged from behind Mars, NASA’s Deep Space Network did not observe a signal,” the statement read.

As a result, NASA’s MAVEN team now has a mystery on its hands, as it has begun investigating what it characterizes as an “anomaly” that disrupted the spacecraft’s communications with Earth.

What is MAVEN?

NASA’s MAVEN mission was launched in November 2013, and almost a year later, the spacecraft made its way into orbit around Mars.

MAVEN’s scientific focus involves explorations of the upper atmosphere of Mars—particularly the region known as the ionosphere—where it observes interactions occurring between the Martian atmosphere and the solar wind. Over the last decade, MAVEN’s investigations have revealed important scientific data about how Mars’ atmosphere is gradually lost to space.

This is important since scientists hope to harness a deeper understanding of how the Martian climate and atmosphere may have evolved. Fundamental questions include whether conditions on Mars in the past may have been more suitable for large quantities of liquid water, which also might point to the existence of life forms that once thrived there, or which may still exist in some areas on the Red Planet.

Beyond its science mission focus, MAVEN also provides a communications relay, which NASA engineers rely on to help them communicate with the robotic rovers, Perseverance and Curiosity, which are carrying out separate missions on the Martian surface.

Overall, MAVEN plays a significant role in the ongoing scientific investigations of the Red Planet, which are adding valuable data to our understanding of its history and evolution over time, all of which supports the ongoing search for life beyond planet Earth.

For the time being, following the unusual signal interruption on December 6, it seems that the Martian environment itself isn’t the only thing showing no signs of life, as NASA engineers continue to try to decipher what caused MAVEN to suddenly go offline.

What Was the “Anomaly” MAVEN Experienced?

As far as what may have caused the unusual signal disruption MAVEN experienced this week, NASA has said little other than that there had been an “anomaly,” the cause of which remains unknown.

There are a variety of things that can cause signal interruptions with distant spacecraft, and NASA’s engineering teams are no strangers to such problems. Over the last several years, a similar interruption occurred with communications to the space agency’s Voyager 1 probe, which suddenly ceased its normal dispatches of scientific data back to Earth in November 2023.

Last year, NASA confirmed that after some miracle work from engineers at mission control, communication was finally reestablished with the probe, revealing that the communication breakdown had resulted from a computer glitch.

Although the same may end up being the case with MAVEN, there are other possibilities too. In the past, signal interruptions have also sometimes resulted from reorientations of spacecraft that can lead to interference with their radio transmissions, as had been the case with a sudden signal loss Voyager 1 experienced decades ago in 1979, just two years after it was launched.

For the time being, whatever has muzzled MAVEN remains a mystery.

“The spacecraft and operations teams are investigating the anomaly to address the situation,” NASA’s statement on Monday read.

“More information will be shared once it becomes available,” it added.

That concludes this week’s installment of The Intelligence Brief. You can read past editions of our newsletter at our website, or if you found this installment online, don’t forget to subscribe and get future email editions from us here. Also, if you have a tip or other information you’d like to send along directly to me, you can email me at micah [@] thedebrief [dot] org, or reach me on X: @MicahHanks.

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