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 30, 2015
Today's Astronomy Picture of the Day is a nice inverted (negative, if you want to go "old school") hydrogen filter image of the Sun. The Earth/Moon "system" is added to give you a little perspective.