A SpaceX Crew Dragon spacecraft with four astronauts aboard successfully docked with the International Space Station early Saturday to start its six-month mission, NASA announced. Crew-2, as it’s been dubbed, is SpaceX’s third astronaut mission under NASA’s Commercial Crew Program. It brings NASA’s Shane Kimbrough and Megan McArthur, Akihiko Hoshide of the Japan Aerospace Exploration Agency (JAXA) and Thomas Pesquet, a French aerospace engineer from the European Space Agency (ESA) to the ISS, which travels at more than 17,000 miles per hour in orbit roughly 250 miles above Earth.