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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| Electron Density |
The number of electrons per unit volume of space. In interstellar space the mean value is about 30,000 per cubic metre. In astrophysics the electron density is important in calculations concerned with the emission and propagation of electromagnetic radiation.
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