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, December 18, 2017
Earthlike is not Earth
Today's Astronomy Picture of the Day shows (hypothetical) images of the Kepler-90 planetary system compared to (actual) images of our system. How "earthlike" are any of the bodies in the Kepler-90 system? Could any support life?
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