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)
Saturday, December 14, 2013
Today's Astronomy Picture of the Day takes us to Cassiopeia, home of NGC 7635, more commonly known as The Bubble Nebula. Will it ever go "pop"?