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)
Saturday, March 31, 2018
Twilight
Today's Astronomy Picture of the Day gathers two inner-system evening stars (Mercury and Venus) in the sky with our own Moon.
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