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)
Friday, August 28, 2015
Embedded Shocks
Today's Astronomy Picture of the Day shows the echoes of supernova Puppis A, still blasting into the surrounding interstellar medium thousands of years after the actual event.
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