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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| Inverse Square Law |
A relationship between two physical quantities in which one declines in proportion to the reciprocal of the square of the other. Gravity is an example where the inverse square law operates. Mathematically, the attractive force F between two masses m and M can be expressed as F = GmM/r2 where r is the distance between the masses and G is Newton’s gravitational constant.
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