A team of researchers at MIT proposes establishing gas stations in space as a possible way to help cut the cost of future missions to the Moon.

Before you point out that establishing a "gas station" in space would require fuel to be hauled up to it in the first place, rendering such a concept moot, the MIT team points out that lunar missions carry a supply of "contingency propellant". This is essentially the equivalent of a can of extra gas thrown in the boot that can be pulled out in the case of an emergency.