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)
Thursday, August 9, 2018
Red and Blue
The title of today's Astronomy Picture of the Day says it plain: red planet, red Moon, red Mars. But also blue water and blue sky.
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