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What is a nebula?
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A nebula is a gigantic cloud of dust and gas, which can be hundreds of light-years across. Some nebulae look dark because they block out light from stars behind them. Other nebulae are bright because they reflect light from stars or because their gas gives off light. Some nebulae gradually clump together and form new galaxies. | | The Orion Nebula is in the constellation of Orion. It is about 1,000 light-years away from us and 15 light-years across. |
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Previous:
Back
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Book:
1001
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Section:
Space
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Chapter:
Galaxies
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