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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| Jansky Symbol Jy |
The unit of flux density used in radio astronomy. One jansky is 10 to the power of -26 watts per square metre per hertz. The unit is named after Karl Jansky, who discovered radio emission from the Milky Way in 1932.
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