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)
Saturday, September 1, 2018
Wisps
Today's Astronomy Picture of the Day combines data from Earth-observing satellites to show the presence and pathways of sea salt aerosols, carbon aerosols and dust aerosols across our blue planet.
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