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)
Monday, August 4, 2014
Silhouette
Today's Astronomy Picture of the Day shows Saturn's moon Enceladus. A dead moon? Hardly! Jets spewing water vapor are seen silhouetted against a dark background in this picture from the venerable (and still hardworking) Cassini orbiter.
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