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, March 17, 2017
Today's Astronomy Picture of the Day shows several months on phase changes for Venus. Which phase is the brightest in the evening (or morning) sky?