Explore: Binary Stars

A binary star or binary star system is a system of two stars that are gravitationally bound to and in orbit around each other. Binary stars in the night

of binary system are binary stars and binary asteroids, but brown dwarfs, planets, neutron stars, black holes and galaxies can also form binaries. A multiple

telescopes. This occurs because the pair either forms a binary star (i.e. a binary system of stars in mutual orbit, gravitationally bound to each other)

X-ray binaries are a class of binary stars that are luminous in X-rays. The X-rays are produced by matter falling from one component, called the donor

In astronomy, a contact binary is a binary star system whose component stars are so close that they touch each other or have merged to share their gaseous

A visual binary is a gravitationally bound binary star system that can be resolved into two stars. These stars are estimated, via Kepler's third law,

similar bodies (such as comets). A star system of two stars is known as a binary star, binary star system or physical double star. Systems with four

newly formed stars are in binary systems. In the model that best explained the data, all stars initially formed as binaries, though some binaries later split

suns set. Hal Clement's 1957 novel Cycle of Fire depicts a planet in a binary star system where the seasons last for decades and different species dominate

An Interacting binary star is a type of binary star in which one or both of the component stars has filled or exceeded its Roche lobe, also known as a