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, July 11, 2019
Halo Effect
Today's Astronomy Picture of the Day focuses on NGC 3242, popularly known as The Ghost of Jupiter. This "planetary" nebula is actually the remnant of a nova. Not as easily seen by the "backyard observer" are the extended waves of nebular matter outside the central nebula: sucessive shockwaves of gas traveling out from the central star.
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