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Two stars orbiting each other are "binary stars" ...a group of stars near each other, may be formally or informally known as a "cluster".
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There are lots of binary stars. Doing a search on "binary stars" should get you several. It seems that binary (or multiple) stars are about as common as single stars; at least, they are in the same order of magnitude.
The masses of the two stars.
If the binary stars were of too high luminosity it would be impossible to distinguish the two through vision alone. Therefore most visual binary stars are of low luminosity.
Binary stars can be any color that stars can be. There's no need for the two stars in a binary to be the same color.
no way
White stars are usually the hottest, followed by blue stars and then red stars.
Two stars orbiting each other are "binary stars" ...a group of stars near each other, may be formally or informally known as a "cluster".
Binary stars
Yes all binary stars are part of the star system because all galaxies and universes have stars and you have to have at least two stars for it to be binary stars.
Binary what? Binary numbers? Binary stars? Binary fission?
About 50% of all stars are binary stars - they all have different temperatures.
the orbits of binary stars
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Binary stars are very useful for determining the mass of the stars and thus any objects orbiting around them.
"Binary" means there are two stars. And "protostar" means the stars are in an early, or preliminary, stage.