Photos: Atlas 5 launches new weather observer

SpaceX test-fired a Falcon 9 rocket for the second time Saturday after replacing a valve following an earlier static fire test Wednesday. The move has postponed the Falcon 9 rocket’s launch with the Amos 17 commercial communications satellite to no earlier than Tuesday.

SpaceX’s Falcon 9 rocket will go from Cape Canaveral to low Earth orbit in less than 10 minutes Saturday with a Dragon capsule heading for the International Space Station carrying nearly 5,500 pounds of supplies and experiments.

Three days after launching from Cape Canaveral, SpaceX’s Dragon cargo craft has arrived at the International Space Station with around 5,600 pounds of supplies and experiments. The automated, unpiloted supply ship was snared by the station’s robotic arm at 7:21 a.m. EST (1221 GMT) Saturday.