@Diogenese_Shiplap @sickburnbro @IAMAL_PHARIUS @merchantHelios We can actually calculate how much fuel you need for a conventional chemical rocket using the Rocket Equation (Δv = Ve * ln(M0/Mf), where Δv is the change in velocity, Ve is the exhaust velocity, M0 is the initial mass (including propellant), and Mf is the final mass (without propellant). Δv in this case is literally just your escape velocity, which you can calculate by v=sqrt(2GM/r), where G is the universal gravitational constant, M is the mass of the planet, and R is your distance from its gravitational center.

To achieve escape velocity from a planet with 10x earth gravity, your rocket's fuel mass will be roughly the same as the planet's mass. A planet with 6G at sea level would require a few million Saturn Vs strapped together to launch a Mercury capsule into orbit. You might be able to cheat a bit using a fixed-wing aircraft with a nuclear ramjet and then launch your upper stage from there, but that would still be extremely difficult. On a water world where resources are mostly under the seabed and therefore more difficult to access, orbit might be logistically impossible barring gravity manipulation technology.

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