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, September 17, 2019
Water
Today's Astronomy Picture of the Day is an artist conception of K2-18b, an exoplanet around the star K2-18, near the constellation of Leo. What makes this exoplanet unique? A "significant amount" of water vapor has been detected at this exoplanet, a necessary component for life (as, they say, we know it).
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