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)
Thursday, April 28, 2016
Dust in the Stellar Winds
Today's Astronomy Picture of the Day shows the Angel Nebula, a dusty "galactic cirrus cloud" (can you imagine the scale of such a thing?) in the constellation of Ursa Major.