Definition of rest frame in English:
A frame of reference relative to which a given body is at rest.
- Soon afterwards it was realized that if the energy of a cosmic-ray proton exceeded 5 x 10 9 GeV then, in its rest frame, a typical cosmic-background photon would be Lorentz-boosted to gamma-ray energies high enough to excite the proton.
- This problem can also be tackled by saying that in the muon's rest frame the Earth's atmosphere appears length contracted, thus allowing a certain percentage of muons to arrive at the Earth's surface.
- Thus our spacetime is more accurately modelled by a cone than by a cylinder, and the real universe, whether finite or infinite, has a preferred rest frame.
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