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A comment on How far could a spaceship go if we never ran out of thrust? (2020). Parent comment

Re:How far could a spaceship go if we never ran out of thrus... by Diggsey on Tuesday August 10, 2021 @08:28AM (#28127975)
What we call "mass" is actually "rest mass" - ie. the mass when the thing is not moving. Photons don't have rest mass because they don't rest.

What photons do have is momentum, and so due to conservation of momentum, hitting a photon will slow you down.

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