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)
Monday, September 9, 2013
Pulsations
Today's Astronomy Picture of the Day shows RS Pup, a "nearby" Cepheid Variable. Such variable stars can be used by astronomers to measure distances throughout the visible universe as the variation of light proceeds along a remarkably rigid cycle.
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