See moment SpaceX launched

Four astronauts from three countries are preparing to leave Earth aboard a SpaceX Crew Dragon capsule, marking the third-ever crewed flight for Elon Musk’s company, and the first from SpaceX to make use of a previously flown rocket booster and spacecraft. CNN’s Rachel Crane reports from Cape Canaveral, Florida.Four astronauts from three countries are preparing to leave Earth aboard a SpaceX Crew Dragon capsule, marking the third-ever crewed flight for Elon Musk’s company, and the first from SpaceX to make use of a previously flown rocket booster and spacecraft. CNN’s Rachel Crane reports from Cape Canaveral, Florida.