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, March 22, 2016
Can you see gravity waves? Perhaps not directly, but "mouseover" today's Astronomy Picture of the Day. You can see their spooky interaction upon the air we breathe.