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Physical Environment > Binary Stars |
This site tells the story of the history of the universe. Click Earlier and Later to follow the story. Note: Many facts have been simplified to make them easier to understand. |
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More than half of all stars have one or more close companion stars, to which it is tied by gravity. When there are only two stars in orbit around each other they are called a binary star. When there are three or more they are called a multiple star.
The closer the stars are together the faster they move. The time it takes for them to go round each other varies from days to years. Some binaries are so close that gravity pulls gas from one to the other, forming an accretion disc around the smaller star in a binary system. This releases X-rays. A nova may also be formed by binary stars. |
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Physical Environment > Binary Stars |
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Basic Information |
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