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This glossary of astronomy terms contains definitions for some of the most common words used in astronomy, cosmology, astrophysics, and space exploration. Binary star definition, a system of two stars that revolve about their common center of e more.
Since 1995, more than 200 extra solar planets have been discovered, demonstrating not only that planetary systems are common, but also that planets may come in a. Any planet is an extremely faint light source compared to its parent star For example, a star like the Sun is about a billion times as bright as the reflected light.
A binary star is a star system consisting of two stars orbiting around their common barycenter Systems of two or more stars are called multiple star systems.