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)
Friday, May 30, 2014
Today's Astronomy Picture of the Day shows Planetary Nebula Abell 36 in the constellation of Virgo. As the central star shuffles towards the white dwarf phase of existence it throws off clouds of gas, creating the nebula.