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)
Thursday, April 16, 2015
Missing Matter
Today's Astronomy Picture of the Day shows NGC 4725 in the constellation of Coma Berenices. Where's the other (at least one) galactic arm?
No comments:
Post a Comment