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 9, 2015
Distortion
Today's Astronomy Picture of the Day shows NGC 1316 and NGC 13176, two galaxies post-collision. What happens when galaxies collide? As "Doc" Smith said, they mostly just pass through each other, but the interacting forces and clouds of matter can distort (or completely "tear") a galaxy. Some galaxies swallow other galaxies (our own may have swallowed three or more).
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