VIDEO: First NTSB briefing on Virgin Galactic accident

SpaceX’s Falcon 9 rocket took off for its sixth flight of the year Monday from launch pad 39A in Florida, lofting an Inmarsat mobile broadband communications satellite to an orbit more than 40,000 miles above Earth.

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.

Days before breaking ground on a new spacecraft assembly line near Cape Canaveral, OneWeb and Intelsat announced a proposed merger Tuesday that would couple a planned fleet of 900 broadband Internet satellites with a high-power communications network in geostationary orbit.