Photos: Atlas 5 rocket soars

Two U.S.-built Intelsat communications satellites destined for different missions fired into space from French Guiana just after sunset Wednesday, vaulting due east over the Atlantic Ocean before separating from their Ariane 5 launcher right on target in geostationary transfer orbit.

SpaceX’s Falcon 9 rocket will launch a third-generation GPS navigation satellite for the U.S. military in 2018, the Air Force said Wednesday, breaking a monopoly held by United Launch Alliance since its formation nearly a decade ago.

NASA officials have determined that the robotic InSight lander is ready for its mission to Mars after concluding that the probe should not suffer the same flaw that led to a crack in a heat shield undergoing tests for the space agency’s Mars 2020 rover, InSight’s chief scientist said Monday.