WATCH: Spacewalking astronauts installing new door for visitors

Astronauts ventured out on a spacewalk Friday to install a new door for visitors at the International Space Station.The two Americans, Jeffrey Williams and Kate Rubins, quickly began hooking up a docking port that will be used by future commercial crew capsules. SpaceX delivered this new gateway last month.Americans haven't rocketed into orbit from their home turf since NASA's last shuttle flight in 2011. SpaceX and Boeing expect to resume human launches from Cape Canaveral in another year or tw