Live coverage: 400th Proton rocket takes off with Russian satellite

In the run up to what may be the final flight of a Zenit launcher, a Russian-Ukrainian creation that ushered in a new era of Soviet-era rocketry, ground crews transferred the powerful booster to a launch pad Wednesday at the Baikonur Cosmodrome.

Poised to loft a Russian-German X-ray astronomy observatory into space Friday, a Proton rocket returned to its launch pad Tuesday at the Baikonur Cosmodrome in Kazakhstan after a three-week delay to replace a drained battery on the vehicle.

A commercial Cygnus resupply craft that received a new corporate owner while berthed at the International Space Station — thanks to Northrop Grumman’s acquisition of Orbital ATK in June — departed the research complex Sunday. The supply ship was released by Canadarm 2 on the space station at 8:37 a.m. EDT (1237 GMT).