A Falcon 9 rocket streaks into orbit Wednesday night from Kennedy Space Center, kicking off the Inspiration4 mission. Credit: Michael Cain / Spaceflight Now / Coldlife Photography
With the backing of a billionaire businessman, four private citizens blasted off Wednesday night from Kennedy Space Center in Florida on a first-of-its-kind fully commercial three-day spaceflight aboard a SpaceX crew capsule, riding to an altitude higher than any person has flown in two decades.

