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, October 20, 2015
It All Ended With a Really Big Bang
Today's Astronomy Picture of the Day is a short video of colliding black holes. You don't want to get between two colliding black holes, believe me.