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)
Wednesday, November 26, 2014
Lunar Dance
Today's Astronomy Picture of the Day shows two of Jupiter's Galilean moons, Io and Callisto, as they pass each other in the same orbital plane, providing lucky observers from earth, with a chance to see a rare occultation.
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