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)
Wednesday, December 19, 2018
Sky Streak
Today's Astronomy Picture of the Day shows the trail of a Geminid meteor as it burns up in our atmosphere. Different elements in the bit of asteroidal grit show up in this image as different colors. Gone in a flash, the trail of the doomed visitor can already be seen spreading out in our atmosphere.
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