Saturday, November 20, 2010

APOD 2.4 (Stephan's Quintet)

November 20

I chose this photo because it shows five of the galaxies that surround our world on every side, all in one small shot via the Hubble telescope.  While one galaxy is obviously not interacting with the others (far off to one side) and another only appears to be part of the group (blue galaxy is actually much closer than the others), the fact that, for the most part, the individual stars in each galaxy are invisible to even one of our most powerful telescopes makes you really think about our significance, since our planet is just one small grain of dust compared to our star, which is microscopic compared to our galaxy at large, so this many galaxies in such a small portion of the sky means our chances of finding a good alternative to Earth before our resources run out look very slim.

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