Video: Change of command aboard International Space Station

Sierra Nevada Corp. has booked at least six launches on United Launch Alliance’s new Vulcan Centaur rocket to carry Dream Chaser supply ships into orbit on cargo runs to the International Space Station beginning in 2021, becoming the first confirmed customer for ULA’s next-generation launcher.

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.

The Soyuz MS-07 spacecraft carrying U.S., Russian and Japanese space fliers returned to Earth on Sunday with a parachute-assisted, rocket-cushioned touchdown on the Kazakh steppe after 168 days in orbit.