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In introductory mechanics, the momentum of a particle is its mass times its velocity. In electrodynamics, the momentum of a field is proportional to the cross-product of the electric field with the magnetic field. In special relativity, momentum is generalized to four-momentum.
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votes
Can a rocket keep moving forever in outer space even if its no longer using fuel?
If your question was, "would it keep moving if it doesn't encounter any gravitational field"
Yes it would.