Wednesday, April 13, 2011

APOD 4.2: Spiral Galaxies

Well, here I go again on another entry concerning Spiral Galaxies. So, Exhibit A: M74.  This galaxy doesn't seem to have a real name, but everyone just loves calling it "The Perfect Spiral". The galaxy is 32 million light years away, and scientists estimate it has over 100 billion stars.

M74: "The Perfect Spiral"

You can clearly see why everyone loves this one so much, since it really does have a perfect spiraling appearance. Although the disk looks flat to us from this vantage point, the reality is that the center of the spiral really bulges out to be over twice as thick as the rest of the galaxy is. Below is another shot of M74, in a slightly different lighting. Perhaps this photo was taken in a different spectrum, and converted differently.

Another shot of M74

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