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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| Tracking And Data Relay Satellite System |
A network of four satellites, launched from Space Shuttles in 1983, 1986, 1988 and 1989, used to track NASA spacecraft and relay their data and commands more efficiently than is possible with a ground-based tracking network. It is the first space-based global tracking system.
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