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Disc

A pancake-shaped structure composed primarily of young and middle-aged stars, and having abundant gas and dust. Some old stars are also present. The disc surrounds the bulge in a spiral galaxy. The disc in the NASA / Amazing Space Glossary of Astronomy Terms Milky Way is 100,000 light-years across and 2,000 light-years thick.

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  • Industry/Domain: Physics
  • Category: Astronomy
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