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, October 16, 2017
Echoes
Today's Astronomy Picture of the Day is a short conceptual video showing the death spiral of two neutron stars. The echoes of such an event—ripples of both gravity and electromagnetic radiation—were recently detected.
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