A binary star or binary star system is a of two that are bound to and in around each other. Binary stars in the night sky that are seen as a single object to the naked eye are often resolved as separate stars using a , in which case they are called visual binaries. Many visual binaries have long orbital periods of several centuries or millennia and therefo.
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The Sun is the Solar System's star and by far its most massive component. Its large mass (332,900 ), which comprises 99.86% of all the mass in the Solar System, produces temperatures and densities in its high enough to sustain nuclear fusion of hydrogen into helium. This releases an enormous amount of , mostly into as peaking in .
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