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, April 9, 2016
Flash!
Today's Astronomy Picture of the Day shows the green flash. I've been told you only see this through the bottom of a Heineken bottle.
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