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, January 7, 2016
NuSTAR Looks at the Neighbor
NASA's Nuclear Spectrosopic Telescopic Array took at look at our largest neighbor, Messier 31, the Andromeda Galaxy. Today's Astronomy Picture of the Day maps some of the X-ray sources found within that galaxy.
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