From the Astronomy Photo of the Day commentary:
NGC 4631 is a big beautiful spiral galaxy seen edge-on at only about 30 million light-years away. This galaxy's slightly distorted wedge shape led to its popular moniker of the Whale galaxy. The Whale's dark interstellar dust clouds and young bright blue star clusters highlight this panoramic color image. The band of NGC 4631 not only appears similar to band of our own Milky Way Galaxy, but its size is truly similar to our Milky Way as well. The galaxy is also known to have spouted a halo of hot gas glowing in x-rays. The Whale galaxy spans about 140,000 light years and can be seen with a small telescope toward the constellation of the Hunting Dogs (Canes Venatici).
Click on the photo to get a bigger version.
If Kelly can post photos of cats, I can post photos of galaxies...
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