Space exploration began with the launch of Sputnik and Astrophysics was born as the application of physics to the phenomena observed by Astronomy, which etymologically means laws of the stars.
There are 2759 entries in this glossary.| Term | Definition |
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| Semidetached System |
A binary star system in which one star has expanded to the extent that its outer layers are pulled away by the gravitational attraction of the companion star. Material streams on to the companion from the larger star, which is described as having filled its Roche lobe.
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