Live coverage: Atlas 5 countdown and launch journal

SpaceX’s Dragon cargo capsule arrived at the International Space Station early Sunday with 3.5 tons of supplies and experiments, including an inflatable room to test out technologies for future use on deep space missions. British astronaut Tim Peake captured Dragon with the robotic arm at 7:23 a.m. EDT (1123 GMT).

SpaceX test-fired its next Falcon 9 rocket at NASA’s Kennedy Space Center on Saturday in preparation for the company’s 17th launch of the year, a mission tentatively set for liftoff Wednesday with a secretive payload named Zuma for the U.S. government.

Delays have set up the possibility of up to three rocket launches this weekend from different pads along Florida’s Space Coast, including two SpaceX missions on Sunday that could set a company record for the shortest span between two Falcon 9 rocket launches. But in the world of ever-changing launch schedules, numerous factors such as weather and technical issues could thwart launch plans this weekend.