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#800319 - 01/12/13 04:32 PM What Is a Galaxy *New Article*
Mona - Astronomy Offline
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Koala

Registered: 05/01/10
Posts: 2199
Loc: United Kingdom

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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#800777 - 01/15/13 02:51 PM Re: What Is a Galaxy *New Article* [Re: Mona - Astronomy]
Mona - Astronomy Offline
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Koala

Registered: 05/01/10
Posts: 2199
Loc: United Kingdom
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
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#845785 - 11/19/13 07:50 PM Re: What Is a Galaxy *New Article* [Re: Mona - Astronomy]
Mona - Astronomy Offline
BellaOnline Editor
Koala

Registered: 05/01/10
Posts: 2199
Loc: United Kingdom
Nice collection of images illustrating the different types of galaxies. And more about galaxies here.
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