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, February 10, 2015
Today's Astronomy Picture of the Day shows one of the longest filaments ever seen on the Sun. Clocking in over 700,000 kilometers, it is longer than the radius of the Sun.