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 17, 2015
Today's Astronomy Picture of the Day shows the main part of Ursus Major, The Big Dipper, or The Plough. Do you know how to use the Big Dipper to find the Little Dipper and the North Star?
("Mouseover" the image to get a star guide.)