SpaceX is poised to ignite a new era of human spaceflight this week when its Crew Dragon capsule carries two NASA astronauts to the International Space Station (ISS). The Demo-2 test flight is scheduled for 3:22 p.m. ET on May 30 after a launch attempt was scrubbed on May 27 due to weather. The mission marks the first time in nearly a decade that a crewed journey into space will lift off from a launch pad in the United States—and the first time a private spaceflight company has used its own rocket and spacecraft design to fling humans into orbit.