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In page Nuclear photonic rocket:
"Feasible current, or near-term fission reactor designs can generate up to 2.2 kW per kilogram of reactor mass.[citation needed] Without any payload, such a reactor could drive a photon rocket at nearly 10−5 m/s² (10−6g; see g-force). This could perhaps provide interplanetary spaceflight capability from Earth orbit. Nuclear fusion reactors could also be used, perhaps providing somewhat higher power.[citation needed]
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