Mars swung between humid and arid conditions before it dried up
https://www.newscientist.com/article/2274074-mars-swung-between-humid-and-arid-conditions-before-it-dried-up/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
Mars swung between humid and arid conditions before it dried up