Video: Change of command aboard International Space Station

When the countdown hit zero last Friday and the engines powering a previously flown Falcon 9 first stage roared to life for takeoff, the four astronauts strapped into a SpaceX Crew Dragon some 21 stories up started laughing.

The next three-person crew will launch to the International Space Station sometime between July 23 and July 25 after a two-month delay triggered by the failure of an unmanned Progress resupply mission in April, Russian officials said Tuesday.

A Russian cosmonaut, his Canadian co-pilot and a NASA flight engineer boarded their Soyuz spacecraft, undocked from the International Space Station and plunged back to Earth Monday evening, landing on the balmy steppe of Kazakhstan to close out an action-packed 204-day mission.