The rockets that are pushing the boundaries of space travel

Friday morning at 5:42 am (0942 GMT), a rocket owned by the US company SpaceX will blast off from Florida carrying two and a half tons of gear from NASA, only to dock three days later and 250 miles (400 kilometers) above Earth at the International Space Station. It launched a NASA satellite into orbit two months ago, then landed back on Earth -- upright -- on a barge in the Atlantic Ocean off Cape Canaveral. It flew a mission to the ISS in 2016.

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