Elon Musk, founder of SpaceX, says his company plans to cut the cost of accessing space partly by reducing the cost of a rocket's first stage. He argues a big part of the overall cost of a rocket is the first stage, so cutting that will reduce launch prices. The company's experimental Grasshopper program aims to develop reusable first stages.
Musk also said that he founded SpaceX with the ultimate goal of planting a human colony on Mars, and that remains the ultimate goal.
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