Term
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Definition
| A star forms when gas and dust from a nebula condense. It produces an accreation disc that spins rapidly around it, gathering more material into it. Eventually it wiill have such a high temperature that a nuclear reaction takes place. |
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Term
| What are the two types of nebulae? |
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Definition
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Term
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Definition
| A cloud of gas, dust, ironized gases, hydrogen and helium in space and is where stars are formed. |
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Term
| What happens to the excess material blown away from the force of the initial nuclear reaction? |
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Definition
| It forms planets and other bodies around the stars. |
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Term
| Give a description of Emission Nebulae. |
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Definition
Emission nebulae are clouds of high temperature gas. The stars inside warm the gas by ultraviolet radiation which causes the electrons in the gas to ionize and emit radiation; seen as light and radio waves. Hydrogen is the most common element inside the gas and when ionized, produces a red colour. |
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Term
| Give a description of Absorption nebulae. |
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Definition
| Absorption nebulae are clouds of gas and dust that block off the light from the stars inside it and so appear as a dark patch set against the Milky Way. They were first discovered by William Hershel. |
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