Scientists have figured out a key part of Mars' history after examining a meteorite believed to date back 4.5 billion years.

Additionally, the researchers estimated that if Mars had a layer of smectite approximately ... dioxide believed to have been lost from Mars' atmosphere since the planet transitioned to its current ...

This is when scientists think Mars' atmosphere first began to collapse ... In Buhler's model, a 0.4-mile-thick layer of carbon dioxide deposits on top of a 2.5-mile-thick layer of water ice ...

With its carbon dioxide-rich atmosphere, and artificially increased ammonia levels, Mars could have an ozone layer that is thick enough to filter solar radiation. This would allow future ...

The team found that to store the amount of methane needed to leach most of the carbon dioxide from the atmosphere of Mars, ...

A new study suggests that Mars could have sustained rivers and seas even after it began cooling down due to a cycle of water and carbon dioxide. The carbon dioxide ice settled on the south polar ...