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)
Monday, January 12, 2015
Today's Astronomy Picture of the Day is actually a game that shows you how lucky we are to live in a period where our home system is relatively stable. Can you create a stable planetary system? Or will you end up with a game of cosmic billiards?