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, October 1, 2019
Today's Astronomy Picture of the Day is a short (humorous) video about being safe around black holes. Safety first when traveling interstellar danger zones!