The red planet
used to have drinkable water!
A picture is emerging of ancient Mars in which neutral water existed at multiple locations, quite possibly raining down from the sky. Over the course of millions of years, Mars has gotten progressively drier and colder, resulting in highly concentrated pockets of acidic water.
Another interesting fact:
Though it was only designed for a 90-day mission, Opportunity is now approaching its 3,400th day of operation. It arrived on Mars over nine years ago on January 25, 2004.
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