How much of the Martian atmosphere has escaped into the void of space?
In short: NASA's MAVEN mission was the first to focus specifically on the Martian upper atmosphere. By measuring the current rate of atmospheric escape, scientists aim to extrapolate backward in time to understand how Mars transformed from a potentially habitable world with liquid water into the arid desert we see today.
Aimed at resolving a planetary enigma, the Mars Atmosphere and Volatile Evolution (MAVEN) craft departed via a United Launch Alliance Atlas V 401 rocket on November 18, 2013, from Cape Canaveral Air Force Station. By examining solar wind and planetary interactions, this mission seeks to calculate the total Martian atmospheric loss to space throughout history. The spacecraft was specifically designed to investigate the planet's ionosphere and its interactions with solar wind.
To achieve this, MAVEN carries a science payload of 143 pounds consisting of eight different instruments. These tools allow researchers to observe the upper atmosphere, ionosphere, and the processes that drive atmospheric loss. This data is vital for reconstructing the history of Mars' climate and understanding why liquid water, once potentially abundant on the surface, is no longer present. The craft's power is supplied by more than 2,000 solar cells spread across four panels. These panels generate between 1,150 and 1,700 watts of electricity depending on its orbital position.
The mission's technical journey has been complex. After entering Mars orbit on September 21, 2014, the spacecraft has provided a wealth of data regarding how the atmosphere responds to solar activity. In February 2023, the spacecraft briefly entered safe mode due to an issue with its Inertial Measurement Unit (IMU), but it successfully exited the mode and returned to operations shortly after. The IMU issue occurred when the unit was powered up for a minor maneuver intended to reduce eclipse durations.
MAVEN's mission was declared ended on June 3, 2026, following a loss of contact that began on December 6, 2025. The total mission duration, from launch to the end of the mission, was calculated at 12 years, 6 months, and 16 days. The mission's communications include an Electra UHF package for relaying data from landers and rovers back to Earth.
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Sources
- Summary by Intellect · source: Mars Bound MAVEN Probe Launches
- Also: MAVEN - NASA Science
- Also: MAVEN Status Update - NASA
- Also: Mars Atmosphere and Volatile EvolutioN (MAVEN) | Goddard Engineering and Technology Directorate
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