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)
Friday, October 18, 2019
The Outsider
Today's Astronomy Picture of the Day is a Hubble Space Telescope image of Comet 2I/Borisov, the second body to be recognized as an interstellar interloper coming in for a visit to our neighborhood.
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