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, June 12, 2018
Side by Side
Today's Astronomy Picture of the Day is a short video comparing the sizes of known planets (and stars) in the universe. How does the Earth stack up?