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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| Extrasolar Planet |
A planet orbiting around a star other than the Sun. Techniques capable of detecting small cyclical changes in the velocities of stars by means of the Doppler effect led to the first substantial evidence for extrasolar planets around normal stars being presented in 1995 and 1996. Stars for which planets have been claimed include 51 Pegasi, 47 Ursae Majoris, Rho1 Cancri, Tau Boötis, Upsilon Andromedae, 70 Virginis, HD 114762 and 16 Cygni B.
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