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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| Photoelectric |
Making use of the photoelectric effect, whereby electrons are liberated from the surface of a solid material when it is struck by photons of electromagnetic radiation. Since the number of electrons emitted is proportional to the intensity of radiation, photoelectric detectors provide an effective method of measuring light intensity.
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