Corrected entry: The crew are sent spaceward to rendezvous with spaceship Endurance atop a very large rocket booster, very much like a gigantic Saturn 5. Once they traverse the wormhole and commence exploration, they ferry themselves from orbit to each planet's surface and back again aboard rather small single-stage vehicles. If each ferry vehicle is that capable, then why did they need the huge Saturn-type rocket just to get them to Endurance?
Phaneron
10th Nov 2014
Interstellar (2014)
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Correction: It could simply be to conserve fuel. They didn't have enough fuel to visit every potentially habitable planet so they would take whatever measures they could to ensure that the smaller vehicles had as much fuel as possible.
Phaneron ★