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.

SpaceX’s Dragon supply ship returned to to Earth on Sunday with more than 3,800 pounds of NASA cargo, research specimens and other hardware. The commercial capsule was released from the International Space Station’s robotic arm at 4:40 a.m. EDT (0840 GMT), and splashdown in the Pacific Ocean west of Baja California occurred at approximately 10:15 a.m. EDT (1415 GMT).

An all-new SpaceX Falcon 9 rocket fired its engines Friday night on launch pad 40 at Cape Canaveral, the opening act in a busy weekend of SpaceX launch preps leading up to a pair of blastoffs Sunday and Tuesday from California’s Central Coast and Florida’s Space Coast, respectively.