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- A pair of stars moving in orbit around their
- common centre of mass.
- Observations show that most stars are binary,
- or even multiple - for example, the nearest
- star system to the Sun, Alpha Centauri. A
- spectroscopic binary is a binary in which two
- stars are so close together that they cannot
- be seen separately, but their separate light
- spectra can be distinguished by a
- spectroscope. Another type is the eclipsing
- binary.
-