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, September 17, 2013
Lensing
Today's Astronomy Picture of the Day shows Abell 1689 a galaxy cluster (now, think about that for a moment) that has an effect on the light that passes nearby, causing light to bend and be visible as streaks.
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