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A fusion drive would fit your requirements, and produce plenty of thrust. One of the early designs estimated that the VISTA spacecraft could deliver a 100-tonne payload to Mars orbit and return to...
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#1: Attribution notice removed
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System
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2021-03-30T23:53:15Z (about 3 years ago)
Source: https://worldbuilding.stackexchange.com/a/31504 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/