Live coverage: International crew lands in Kazakhstan

China’s Tiangong 2 space lab, a precursor to the country’s planned space station, is scheduled to fall out of orbit Friday and plunge back into Earth’s atmosphere for a destructive re-entry.

Investigators believe a leak of propellant inside the Crew Dragon spacecraft’s propulsion system led to the capsule’s explosion April 20 during a ground test at Cape Canaveral, and a senior SpaceX official said Monday that delays are making it “increasingly difficult” to fly astronauts on the commercial spaceship before the end of the year.

A corrective software patch has fixed a problem with a newly installed grapple fixture on one end of the International Space Station robot arm, NASA officials said Sunday. With the mechanism now fully operational, a re-planned spacewalk Monday to re-install a degraded unit has been called off.