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)
Wednesday, September 20, 2017
Corona and Prominences
Today's Astronomy Picture of the Day combines forty separate images to produce this view of our home star and our own moon during the recent eclipse, plus the corona and looping prominences of our quiet sun.