Live coverage: Soyuz test flight concludes with landing in Kazakhstan

Ground controllers sent commands Saturday for the International Space Station’s Canadian-built robotic arm to release a SpaceX Dragon cargo capsule, ending the ship’s nearly four-week stay at the orbiting research complex.

Northrop Grumman called off the launch of an Antares rocket and a Cygnus space station cargo freighter Thursday night on Virginia’s Eastern Shore, the third aborted countdown in less than 24 hours for three different U.S. rockets.

NASA and Roscosmos, the Russian space agency, have agreed to extend astronaut Peggy Whitson’s stay aboard the International Space Station by three months to enable uninterrupted research aboard the orbital laboratory during a period when Russia is temporarily reducing its crew complement, the U.S. space agency said Wednesday.