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SpaceX is set to launch its first astronauts to the International Space Station on Saturday — a mission that would make history, but is not without significant risks.
Elon Musk, the founder of SpaceX, has said his biggest concern is not the rocket launch, though: It's safely returning NASA astronauts Bob Behnken and Doug Hurley to Earth.
Musk said he's worried about the Crew Dragon spaceship's asymmetric design, which he said has a minor chance of causing the spaceship...
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