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, October 19, 2017
A Classic Messier
Today's Astronomy Picture of the Day shows Messier 51 (known separately as NGC 5194 and NGC 5195). This astronomical wonder is relatively easy to find (see the text in the link) and a nice target for even small astronomical refractors.
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