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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| Frequency Symbol ν Or F |
The number of times a repetitive phenomenon occurs in a unit of time. In the case of waves, the frequency is the number of waves passing a fixed point in a second. The basic unit of frequency is the hertz Hz.
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