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, November 6, 2019
Great Spirals
Today's Astronomy Picture of the Day shows Messier 101, the Pinwheel Galaxy, a spiral galaxy in the constellation of Ursa Major (the Great Bear, part of which is the Big Dipper). The image above is a composite, combining light from various frequencies, to tease out the structures embedded in this galaxy.
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