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)
Monday, January 7, 2019
Transients
Today's Astronomy Picture of the Day shows some transients. Several Geminids flash through the constellation of Taurus. At a slightly more leisurely pace, Comet 46P/Wirtanen is also moving through the field of view. Or course, if we move the scale up further, the stars visible here are also transient: they are moving and they are aging.
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