These great hollow globes of artificial super-metals, and artificial transparent adamant, ranged in size from the earliest and smallest structures, which were no bigger than a very small asteroid, to spheres considerably larger than the Earth. (Olaf Stapledon, STAR MAKER)
Thursday, February 23, 2017
TRAPPIST-1
Today's Astronomy Picture of the Day is artwork depicting the seven Earth-sized rocky worlds in the system of TRAPPIST-1.
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