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What Is a Galaxy *New Article*
#800319 01/12/13 12:32 PM
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Mona - Astronomy Offline OP
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Mona - Astronomy
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What is a galaxy? A great star system held together by gravity, with stars, gas and dust, black holes and dark matter. Astronomers used to think our Galaxy was the whole universe. But now that we know of billions of galaxies, they're considered to be the building blocks of the universe.

What Is a Galaxy
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Re: What Is a Galaxy *New Article*
Mona - Astronomy #800777 01/15/13 10:51 AM
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Not long after I'd written the galaxy article, there was an announcement about the biggest known spiral galaxy. It had always been considered a biggy, but getting an ultraviolet image showed an extended structure that we can't see in ordinary light.
It's about five times as big as the Milky Way. Wow!

Barred spiral galaxy NGC 6872
Re: What Is a Galaxy *New Article*
Mona - Astronomy #845785 11/19/13 03:50 PM
Joined: May 2010
Posts: 11,963
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Mona - Astronomy Offline OP
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Mona - Astronomy
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United Kingdom
Nice collection of images illustrating the different types of galaxies. And more about galaxies here.

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