Space Shuttle retirement leaves a downmass gap (2011)
NASA retired the Space Shuttle, its only vehicle able to bring large cargo back from orbit. For years afterward, SpaceX's Dragon capsule was the main way to return significant mass from the International Space Station.
Researchers faced tight limits on how much they could bring home from orbit.
Return capacity, not launch capacity, became the bottleneck for orbital science and manufacturing.
Starfall attacks that bottleneck directly. The question it tests is whether cheap, frequent return can finally match cheap launch.
