NASA | Mars Atmosphere Loss: Neutral Processes

Mars, once possibly having a thicker atmosphere similar to Earth's, has lost much of it over billions of years. NASA's MAVEN spacecraft aims to study this phenomenon, focusing on neutral processes where hydrogen molecules escape into space. This loss of atmosphere and water may have transformed Mars from a blue, cloudy planet to the red one we see today.

What do scientists believe about the past atmosphere of Mars?

What processes may contribute to the loss of a planet's atmosphere over time?

How can a molecule escape Mars' atmosphere?

What role does water play in the atmosphere of Mars?

What is the cumulative effect of atmospheric loss on Mars?