Billionaire Elon Musk says his private spaceflight company SpaceX has made some progress toward a permanent colony on Mars -- a long-time goal in the entrepreneur's push to help make humanity a multi-planet species.
Billionaire Elon Musk says his private spaceflight company SpaceX has made some progress toward a permanent colony on Mars -- a long-time goal in the entrepreneur's push to help make humanity a multi-planet species.
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