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Maybe you don't carry your own fuel? https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.1079.9524&rep=rep1&type=pdf https://citeseerx.ist.psu.edu/viewdo

• shagie 4y ago
  That's interstellar - which is a different set of problems. The main one is getting out of the gravity well of the planet. https://arxiv.org/pdf/1803.11384.pdf https://arxiv.org/pdf/1803.11384.pdf On a super earth, such as Kepler 20b ( https://en.wikipedia.org/wiki/Kepler-20b https://en.wikipedia.org/wiki/Kepler-20b ) in order to lift 1 ton of mass to orbit, it would need 9000 tons of fuel -- about 3x larger than the Saturn V. To get the JWST off the planet, it would take 55,000t of fuel. To get that 45t of an Apollo mission off the planet, it would take about 400,000t of fuel over 100x more than the fuel needed for Saturn V.