When the Sun’s energy hits Mars’ upper atmosphere, it can knock particles loose and push them into space. Some of this happens slowly through well-known processes like photochemistry.

In a nutshell Mars’ missing atmosphere may not have escaped to space as previously thought. Instead, it likely underwent a chemical transformation and became trapped as methane within the planet ...

Comparing the thickness of Mars' atmosphere and its water loss at perihelion to aphelion, in these Hubble Space Telescope images of the Red Planet. (Image credit: NASA/ESA/STScI/John T. Clarke ...

Thirteen years into its mission, NASA's Curiosity rover is still uncovering Martian mysteries — and learning to do more with ...

Electrons released when cosmic rays strike water-ice can provide energy for microbes and facilitate the formation of complex ...

"We really got the full range of space weather at Mars from May 11-20, from large flares, CMEs and an extreme solar energetic particle burst, and we've only begun to scratch the surface analyzing ...

Taken by a Mars orbiter called MAVEN, or Mars Atmosphere and Volatile EvolutioN, the images were taken six months apart in July 2022 and January 2023 respectively, showing how the environment of ...

ESA’s Mars Express has shed new light on the Red Planet’s rare ultraviolet aurora by combining for the first time remote observations with in situ measurements of electrons hitting the atmosphere.

The European Space Agency broadcast the livestream of stunning views of Earth’s next-door neighbor from the Mars Express to commemorate the spacecraft’s 20th anniversary.

Unlike Earth, Mars doesn’t have a global magnetic field to protect it from space weather. That left its upper atmosphere open to the solar wind—charged particles that stream out from the Sun.