Ancient Mars Had Planet-Wide Rainstorms So Intense They Breached Its Lakes – ScienceAlert

Billions of years ago, rain once fell on the Martian plain, and not always softly. 
New research on the Red Planet’s now-empty lakes suggests a huge amount of liquid water must have spilled from the skies roughly 3.5 to 4 billion years ago, enough to sculpt river-like channels and breach several lake basins.
“This is extremely important because 3.5 to 4 billion years ago Mars was covered with water. It had lots of rain or snowmelt to fill those channels and lakes,” says planetary scientist Gai…

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