They can't launch directly to Mars. The idea is to have a 'fuel' Starship designed to carry fuel reach orbit. Then launch a 'crew' Starship into orbit and have

They can't launch directly to Mars. The idea is to have a 'fuel' Starship designed to carry fuel reach orbit. Then launch a 'crew' Starship into orbit and have the 'fuel' Starship refuel the 'crew' Starship for its voyage to Mars. Starship can however return from Mars to Earth directly due to Mars smaller gravity.