Tuesday, December 27
Mercury's day is longer than its year
Mercury's day is longer than its year: 
A solar day (noon to noon) on Mercury is as long as 176 Earth days. But its year (one orbit around the sun) takes only 88 Earth days. So the day is two years long... (Details here).
Photo from the Messenger spacecraft, which is mapping the planet, via NASA's Astronomy Photo of the Day.
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