Particle

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Particle

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1. An elementary subatomic particle such as proton, electron, neutron, etc. </dd>
2. A very small piece of matter. </dd>
3. In celestial mechanics, a hypothetical entity which responds to gravitational forces but which exerts no appreciable gravitational force on other bodies, thus simplifying orbital computations. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use