Astronauts can use 3D and molecular printers for shelter construction and food preparation on site instead of having to carry the materials to mission sites, thus A. lowering the long-run average cost of exploring the solar system, but increasing labor costs. B. lowering the long-run average cost of exploring the solar system, but increasing material costs. C. increasing the number of required rocket missions and thereby reducing the long-run average cost of exploring the solar system D. reducing the number of required rocket missions and thereby reducing the long-run average cost of exploring the solar system.
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