Time to open the thirty-first (and next-to-last) door in the advent calendar. Until the New Year, I’ll be opening a door onto a different landscape from somewhere in the solar system. Where in the solar system are these dark-rimmed craters? Door 31The image has a resolution of 6.3 meters per pixel and covers an area about 3.2 kilometers square. Credit: NASA / JPL / UMD This view of the pitted nucleus of comet Tempel 1 is composed of many frames ….
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