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, February 27, 2017
Hubble vs. Einstein
Today's Astronomy Picture of the Day of a Einstein Ring calls into question the Hubble Constant. I love a good cosmic mystery!
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