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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| Hadron Era |
The period from 10 to the power of -35 to 10 to the power of -6 seconds after the primordial Big Bang. During this interval, the behaviour of the universe was dominated by the strong interaction, the force governing the interactions between unstable elementary particles known as hadrons, which are more massive than protons and neutrons.
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