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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| Mach’s Principle |
A philosophical idea propounded by Ernst Mach 1838-1916 to the effect that the inertial properties of an individual piece of matter are determined by the distribution of distant matter in the universe. Einstein was influenced by this idea, though he and others have failed to incorporate it into his General Relativity theory.
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