from earth to the moon and back to earth
is that it takes too much rocket fuel
if spaceplanes launch vertically as rockets from earth
and travel to the moon
and then return from the moon to earth
and land as spaceplanes on runways on earth
then those spaceplanes don't need fuel land
which rockets do since rockets brake while landing vertically
or if rockets that return from the moon to earth
are refueled in earth orbit by reusable tanker rockets
then the refueled rockets have enough fuel to land vertically on earth
and if the moon is industrialized
then a maglev launcher can be built on the moon
that launch spaceplanes towards earth
so that spaceplanes use fuel to travel as rockets from earth to the moon
and those spaceplanes
are then launched by a maglev tracks towards earth
and land as spaceplanes on runways on earth
any of the different chemical components of moon dust
could be turned into plasma and be used as reaction mass
but oxygen from moon dust would need the least energy
to be turned into pasma and used as reaction mass by rockets
if that reaction mass is turned into plasma
by nuclear micro reactors onboard the rocket
or if the rocket has extremely powerful batteries
that are recharged with solar power on the moon
then the rocket could turn oxygen from moon dust into plasma
as reaction mass
or if solar power satellites use lasers to transfer energy
to receivers on the rocket
so that the rocket could turn oxygen from moon dust into plasma
as reaction mass
any of the chemical components of moon dust
could be turned into plasma by rockets and be used as reaction mass
but silicon, calcium, iron, aluminum, magnesium and titanium
would need more power than oxygen
to be turned into plasma by a rocket engine