Proton (disambiguation)
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A proton is a subatomic particle with a positive fundamental electric charge of 1.6 × 10-19 coulomb and a mass of 938 MeV.
Proton may also refer to:
In astronomy:
- Proton rocket, Russian unmanned space vehicle design
- Proton satellite, Soviet artificial satellite
- Proton-proton chain reaction, one of two fusion reactions by which stars convert hydrogen to helium
