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)
Tuesday, August 20, 2019
At the Blue Event Horizon
Today's Astronomy Picture of the Day is a short video depicting the region around a black hole, the accretion disc of gas and dust and debris falling into the singularity at the center. What lies beyond the blue event horizon?
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