Unverified50% confidenceFactExact time
Nuclear thermal propulsion (NTP) can raise specific impulse to around 900 seconds.
1
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50%
Confidence
Long-term
Relevance
10/21/2026
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UnverifiedNTP heats low-molecular-weight propellants such as liquid hydrogen by flowing them through the core of a nuclear fission reactor to above 2500 K before expelling them, achieving a specific impulse of approximately 900 seconds, roughly double that of conventional liquid oxygen/liquid hydrogen engines (approximately 450 seconds).77% similarUnverifiedThe specific impulse of nuclear thermal propulsion can reach approximately 900 seconds, roughly twice that of conventional liquid oxygen/liquid hydrogen engines (approximately 450 seconds).70% similar
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