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The Bussard ramjet idea could very well work - if you plan your route correctly. You're worried about the low number density of hydrogen atoms/ions in outer space. This table shows that this is in...
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#1: Attribution notice removed
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System
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2020-06-01T14:13:42Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/8564 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/