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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| Alpha Particle |
The nucleus of a helium atom, consisting of two protons and two neutrons. Alpha particles are emitted by many radioactive isotopes and also play an important role in nuclear fusion processes within stars.
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