Mars' atmosphere is over 100 times thinner than Earth's and is primarily composed of carbon dioxide, nitrogen and argon gases.

Mars has lost immense amounts of water over it lifetime, and scientists aren't sure exactly how. New research hints that the ...

There may have been no oxygen in the atmosphere of ancient Mars after all, a new study has found, but don't despair, there still could have been living creatures crawling on the planet.

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 ...

Scientists have pondered why Mars seemed to be missing sufficient carbonates indicative of its warm, wet past. Now, NASA’s Curiosity rover may have just solved the mystery.

All evidence points to Mars having had a carbon dioxide-rich atmosphere billions of years ago, but insufficient carbonates in Martian soil challenge this theory. Now, a new study using data from ...

Mars used to have a thick, robust atmosphere, or at least that’s what scientists think they know about the history of the Red Planet. Solar … ...

MIT research suggests Mars’ missing atmosphere — which dramatically diminished 3.5 billion years ago — could be locked in the planet’s clay-covered crust. Water on Mars ...

Webb will perform a major study of Jupiter and has already imaged Neptune. Now, Webb has been used to get a fascinating look at our planetary neighbor, Mars.

A study suggests Mars takes its red hue from a type of mineral that forms in cool water, which could reveal insights about whether Mars was ever able to support life.

Study uncovers source of Mars' redness — a key indicator the planet (maybe) once had life Mars became red before it lost its oceans, challenging previous assumptions about its geologic history ...