For Deep-Space Flights, NASA Wants Gas Stations for Space

The space agency was dreaming big in 1971, also conceptualizing a proposed Orbital Liquid Hydrogen Depot. (NASA Marshall Space Flight Center)

An Earth-to-orbit fuel tanker approaches an orbital propellant depot, As envisioned by Marshall Space Flight Center Program Development planners in 1971. (NASA Marshall Space Flight Center)

Boeing's full concept, from 2007 said that "if there were a fuel depot available on orbit, one capable of being replenished at any time, the Earth departure stage could, after refueling, carry significantly more payload to the Moon." (Boeing)

The space agency was dreaming big in 1971, also conceptualizing a proposed Orbital Liquid Hydrogen Depot. (NASA Marshall Space Flight Center)

An Earth-to-orbit fuel tanker approaches an orbital propellant depot, As envisioned by Marshall Space Flight Center Program Development planners in 1971. (NASA Marshall Space Flight Center)

Boeing's full concept, from 2007 said that "if there were a fuel depot available on orbit, one capable of being replenished at any time, the Earth departure stage could, after refueling, carry significantly more payload to the Moon." (Boeing)