The Rise of DRACO
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It's a thermonuclear thang...
https://interestingengineering.com/darpa-contract-brings-us-closer-to-nuclear-thermal-spaceflight
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If you could enable constant acceleration, say at 1G, travel throughout the solar system would be ridiculously quick.
Accelerate toward Mars at 1G. Halfway through your journey, turn the spacecraft around (flip and burn), and decelerate at 1G.
At its closest, Mars is about 65 million km away. Such a journey would take about 44 hours.
You could get to the moon in about 3 ½ hours.
https://space.stackexchange.com/questions/840/how-fast-will-1g-get-you-there
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