Ancient Mars May Have Had 2 Distinct Water Reservoirs
ExtremeTech -

Mars from Hubble: Astronomers took advantage of a rare close approach by Mars in 2001. When the Red Planet was just 43 million miles away, Hubble snapped this picture with the WFPC2. It has a surface resolution of just 10 miles. This is the best image we’ve gotten of Mars that didn’t involve sending a robot there.

We used to think of Mars as a bone dry husk of a world. While there is some evidence of occasional flowing water on the surface, most of the planet's water is long...

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