Hardware for two air-dropped Pegasus XL launchers previously purchased by Stratolaunch, a space launch company founded by the late billionaire Paul Allen, are now back under Northrop Grumman control and for sale to NASA, the Air Force, or commercial satellite operators, industry officials said.

Follow the key events of the Falcon 9 rocket’s ascent to orbit with 60 satellites for SpaceX’s Starlink broadband network.

More than three years after its launch was delayed by a corporate merger, a commercial Earth-imaging satellite has finally shipped to its California rocket base for liftoff aboard an Atlas 5 in September.