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Water Escaping from Mars

Hydrogen atoms escape from the Mars upper atmosphere, while water containing heavy hydrogen (deuterium) remains trapped on the planet. The escape of hydrogen helped to turn Mars from a wet planet 4.5 billion years ago into a dry world today.
  • Release Date
    February 20, 2018
  • Science Release
    NASA’s James Webb Space Telescope to Reveal Secrets of the Red Planet
    Read the release
  • Credit
    Animation: NASA

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Related Images & Videos

Telescope image of an orange spherical object in space.

Mars (Hubble)

Hubble took this photo of Mars when the planet was 50 million miles from Earth, during its last opposition in 2016. The photo reveals details as small as 20 to 30 miles across.

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Details

Last Updated
Aug 28, 2025
Contact
Media

Laura Betz
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
laura.e.betz@nasa.gov

Animation Credit

NASA

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