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Re:Relativistic Spaceship by JumpCrisscross on Monday February 05, 2024 @04:59PM (#39267831)
> Can you explain why matter-antimatter only has 60% efficiency?

We don’t know how to use all the reaction products for thrust [1].

[1] https://en.m.wikipedia.org/wiki/Electron–positron_annihilati...

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