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This is a view from orbit of the surface of Mars. That dark line down the center? That's the tracks left by the Curiosity rover as it traveled from Bradbury Landing to Shaler Outcrop.
You can see the full-sized picture and read a more detailed explanation here. It's really worth your time to see the expanded, more detailed version.
My thanks to Gregory Frost for turning me on to this.
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Every now and then I snap (or am snapped) out of my day-to-day somnolence by items such as this, and realize how lucky I am to be alive in these days.
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