Video: Change of command aboard International Space Station

Ground crews loaded time-critical experiments, including 20 mice to help scientists study muscle atrophy, into SpaceX’s commercial Dragon cargo capsule Thursday, a day before a launch planned from Cape Canaveral toward the International Space Station.

A veteran cosmonaut, a German volcanologist and a Navy test pilot-turned-astronaut undocked from the International Space Station and returned to Earth, descending through low clouds to a jarring touchdown on the frigid steppe of Kazakhstan to close out a 165-day stay in orbit.

A Northrop Grumman Cygnus cargo ship arrived at the International Space Station on Monday, delivering nearly four tons of supplies and experiments to the research lab and its crew, including a $23 million titanium toilet and a high-definition virtual reality camera planned for use on a future spacewalk.