NASA's MAVEN Confirms Mars Loses Atmosphere at 100 Grams a Second After Magnetic Field Faded
Updated
Updated · spacedaily.com · Jul 6
NASA's MAVEN Confirms Mars Loses Atmosphere at 100 Grams a Second After Magnetic Field Faded
1 articles · Updated · spacedaily.com · Jul 6
Summary
MAVEN measurements show Mars is still leaking atmosphere into space at about 100 grams per second, directly tying present-day loss to the absence of a global magnetic shield.
Ancient magnetized rocks indicate Mars once had a planet-wide field, but impact-basin dating suggests the dynamo died roughly 4 billion years ago as the small planet's interior cooled.
MAVEN data indicate escape rates were likely hundreds of times higher under the young Sun, helping strip a once thicker atmosphere that supported rivers, lakes and possibly seas.
The transformation was not sudden: researchers describe a loss unfolding over hundreds of millions to billions of years, with weak gravity, water locked in crustal minerals and carbon dioxide trapped in rock also shaping Mars's drying.
That history matters beyond Mars because it links planetary habitability to interior dynamics and magnetic shielding, a factor astronomers weigh when judging whether exoplanets can keep their atmospheres.
Mars lost its magnetic shield and became a frozen desert. Is Earth’s own protective shield truly permanent?
Did solar wind kill Mars, or did the planet entomb its own atmosphere and water in its crust?
With a vast ocean now discovered deep underground, could life be hiding on Mars right now?
MAVEN’s Legacy: How NASA Measured Mars Losing 100 Grams of Atmosphere Per Second and Unlocked the Red Planet’s Climate Evolution
Overview
The MAVEN mission officially ended in June 2026 after an anomaly and loss of contact, leaving the spacecraft unrecoverable and unable to continue its science or data relay work. This conclusion creates a significant gap in Mars atmospheric monitoring and communication relay capabilities, making it harder to maintain reliable contact with current and future Mars rovers and landers. The absence of MAVEN’s relay function presents an immediate challenge for ongoing and upcoming Mars exploration, highlighting the mission’s crucial role in supporting both scientific discovery and operational communication on the Red Planet.