Last week, NASA released findings of a six month-long study to determine the composition and history of Mars’ atmosphere. Scientists working on the project posit that the solar wind has gradually stripped Mars of most of its atmosphere, leaving it with a fraction of the atmosphere that it once had.

Read more about the NASA study below:

NASA has figured out how Mars was stripped clean of water – Quartz

Water on Mars: What Does It Mean? – Voice of America

Mystery Of Mars’ Lost Atmosphere Solved At Last, Thanks To NASA’s MAVEN Mission – Forbes

NASA Mars Findings: Space Agency Set to Reveal Details About Martian Atmosphere – ABC News