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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| Einstein Ring |
A perfect circular image of a distant point source formed when a point mass along the line of sight acts as a gravitational lens. This idealized case of lensing was described by Einstein and has been observed for the imaging of radio emission from the quasar MG1654+1348 by an intervening galaxy.
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