But the point of the matter it doesn't IF it had lunar - derived
propellant depots in hand.
In fact, even from, even without
a propellant depot at Mars, you could do a flyby of Jupiter without
a propellant depot.
So it would require maybe anywhere from your 50 % to 60 % of the energy on Mars to refill the propellants, using
a propellant depot, and just the technical challenges are a lot easier.
So we should, particularly with six ships, have plenty of landed mass to construct
the propellant depot, which will consist of a large array of solar panels — very large array — and then everything necessary to mine and refine water, and then draw the CO2 out of the atmosphere, and then create and store deep - cryo CH4 and O2.
But by establishing
a propellant depot, let's say, you know, Enceladus or Europa, or any — there's a few options — and then doing another one on Titan, Saturn's moon, and then perhaps another one further out on Pluto, or elsewhere in the solar system...