发射倒计时：灵感4号平民太空任务在线观看

　　Follow the four civilians as they launch into space on a three-day trip orbiting Earth and reaching an altitude higher than that of the International Space Station (ISS). The SpaceX Dragon mission, dubbed Inspiration4, is the most ambitious step to date in the rapidly-developing age of civilian space exploration, making history as the first all-civilian mission to orbit.