sunlightIt is generally considered as a single star.Although there are unconfirmedSolar companionRumors of.Stars, planets and asteroids all have single star systems.It may be because of the different ways of formation that planets and asteroids are mostly single stars.Only a few asteroids or satellites form a binary system.However, some large satellites are sometimes considered to form a double planet system with their parent stars.For a long time, people have believed that most stars in the universe are concentrated star systems.withKonductraAnd triads are more common.There are fewer single stars.However, according to a study in 2006, two thirds of the main sequence stars in the Milky Way are single stars, which has changed people's traditional understanding.
Konductra
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A single star may also be mistaken for forming a binary star with another star because of its position.In fact, there is no rotation relationship between them.Such binary stars are calledOptical binary。
Stellar system
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The star system composed of a single star is the simplest, and the orbits of small stars (such as planets) running around the star are relatively simple, and they will not go out because of the influence of multiple large objectsstrangeSo that it is easier to maintain a suitable environment, temperature and light, which is conducive to the existence of life.
Knowledge points
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Optical binary
Optical binaries, also known as apparent binaries or pseudobinaries, mean that the observation distance is very close, but there is noPhysicsDouble Stars of Contact.
Rotation period
Two of the optical binaries areazimuthClose (within 1 angular second), the distance between the two is actually very far, there is no obvious interaction, and they do not rotate around each other.Therefore, optical binaries do not constitute a binary system.Long term observation can find the mutual rotation period of binary system, so it can be distinguished from optical binary system.
