Encara no tenim significats per a "more propellant".
1The refueling or repair vehicles would match orbits, rendezvous, service, and return for more propellant.
2It's the "return for more propellant" part that brings us to on-orbit propellant depots.
3The next shots, fired with increasingly more propellant, eventually disappear over the horizon as they fall.
4But adding more propellant makes a rocket heavier, which makes it harder to reach orbital velocity.
5All that extra juice means that the Falcon 9 can carry heavier payloads and more propellant into space.
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