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, May 26, 2015
Energetic Core
What's going on in the center of spiral galaxy Messier 94? Today's Astronomy Picture of the Day hazards a few theories.
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