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The complete history of the Universe -- from the Big Bang to 200 my into the future

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History of the Universe eBook. 398 pages, 300 illustrations only $2.99

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Binary Stars

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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History of the Universe eBook. 398 pages, 300 illustrations only $2.99

eBook only $2.99
398 pages, 300 images

"I find the science fabulous...an extremely useful teaching tool."
Professor David Christian

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