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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| Relativistic |
Having a velocity close to that of light ; Special Relativity must be used in any calculations involving such velocities and physical theory. The expression ultrarelativistic does not mean faster than light; it is used for particles travelling so fast that their kinetic energy is thousands of times higher than their rest mass energy.
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