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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| Quantum Gravity |
A theory, not yet developed, that aims to unite Grand Unified Theories and a theory of the gravitational interaction into a single unified theory in which all interactions in physics are described by a unified set of equations. If achieved, it would unify General Relativity and quantum theory. In a rigorous form, the theory would describe conditions in the universe about 10 to the power of -43 seconds after the onset of the Big Bang.
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