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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| Foucault’s Pendulum |
A long, free-swinging pendulum devised in 1851 by Foucault to demonstrate the rotation of the Earth. If undisturbed, the plane in which the pendulum swings slowly changes at a rate of 15 × sinangle of latitude degrees per hour of sidereal time.
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