Today's Astronomy Picture of the Day is a nice capstone to how our understanding of Mars has evolved since the 1920's. From a desert planet with canals to a bone-dry dead planet with nothing of interest, to a cratered landscape, to a complicated world with canyons and mountains and craters...to a world that appears to have a potentially significant amount of water under the surface and even water flowing, on occasion, on the surface!
As Kim Stanley Robinson put it: Mars is a place.
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