Galaxies are collections of millions to billions of stars gravitationally bound together. Galaxies come in different shapes and sizes, and fall into three broad categories: spiral (shaped like a pinwheel), elliptical (like a ball, sometimes round and sometimes squashed) and irregular, with no obvious shape or structure. Our own Milky Way galaxy is a spiral.
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- Published6 May 2008 at 17:00 UTC
- Length4 min
- RatingClean