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)
Tuesday, March 12, 2013
Spin Dizzy
Today's Astronomy Picture of the Day looks at how fast, hypothetically speaking, one could spin a black hole. (Hint: very fast.)
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