Live coverage: Falcon 9 disintegrates after launch

Managers have pushed back the next flight of United Launch Alliance’s Delta 4-Heavy rocket from a launch pad in California until no sooner than early December, and the first launch of SpaceX’s Falcon Heavy for the U.S. Air Force has likely been delayed to some time early next year, officials said this week.

SpaceX is finishing up preparations for a major test of a rocket-powered abort system for the company’s new Dragon crew ferry spacecraft, targeting launch from Cape Canaveral in March after a pair of Falcon 9 missions in February.

A SpaceX Falcon 9 rocket fired its nine first stage engines for a brief hold-down firing Friday at Cape Canaveral, passing a key milestone before launch July 24 with a Dragon space station resupply ship.