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, April 5, 2016
Today's Astronomy Picture of the Day is a short video showing what exoplanet Cancri 55e might look like. Larger than Earth, tidally-locked and possibly the home of a gigantic diamond?