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, November 12, 2013
Today's Astronomy Picture of the Day shows Asteroid P5 in our own asteroid belt. Which has unexpectedly spawned multiple tails. Light pressure? Multiple hits from smaller rocks?