Gale Crater might as well have been known as Gale Lake. That is, millions of years ago. And if Martians spoke Earthling English. Using images captured by Mars Curiosity Rover, who landed in that crater and made it its home, and drawing parallels to our own planet's topographical history, NASA finds there might be scientific basis in the hypothesis that the crater was once a lake. Even better, that lake might have existed for millions of years, probably enough to even support the beginnings of life.