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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| Perfect Cosmological Principle |
An extension of the cosmological principle, proposed in 1948 by Herman Bondi and Thomas Gold. It asserts that the universe appears essentially the same at all times for all observers everywhere. This principle is crucial to the steady-state theory but is violated by the Big Bang theory.
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