Live coverage: Proton rocket launches with two U.S.-built satellites

A SpaceX Falcon 9 rocket lifted off Thursday from NASA’s Kennedy Space Center in Florida with the U.S. Air Force’s X-37B mini-shuttle, an unpiloted orbiting military laboratory. Liftoff occurred at 10 a.m. EDT (1400 GMT), and the Falcon 9’s first stage booster successfully landed at Cape Canaveral a few minutes later.

A new European satellite carrying instruments to track changes in the world’s oceans, measure receding ice sheets and chart vegetation growth climbed into orbit Wednesday on top of a Russian Rockot launcher.

The attachment of a mounting bracket for Virgin Orbit’s smallsat launcher under the wing of a modified passenger jetliner portends the start of a series of captive carry tests with a full-scale model of the rocket, culminating in a drop of the vehicle before the first orbital launch attempt.