SpaceX launches first rocket since explosion in Florida

A SpaceX Falcon 9 rocket blasted off from California today, marking the company's first launch since a fireball engulfed a similar rocket on a Florida launch pad more than four months ago.
The two-stage rocket lifted off from Vandenberg Air Force Base at 9:54 am carrying a payload of 10 satellites for Iridium Communications Inc., which is replacing its entire global network with 70 next-generation satellites.
The satellites were expected to be deployed about an hour after launch.
About nine minutes after the rocket blasted off, to cheers from the control room, its jettisoned first stage landed upright on a so-called droneship in the Pacific Ocean south of Vandenberg, part of Spacex's effort to make boosters reusable.

The company has succeeded six times previously with landings on a barge or ashore.
A camera aboard the first stage gave viewers a you-are-there experience as it returned to Earth, flared landing rockets and made a perfect vertical touchdown on the floating pad.

The return to flight is an important step for SpaceX, billionaire Elon Musk's California-based company that has about 70 launches in line, worth more than USD 10 billion. In addition to commercial launches, SpaceX ferries supplies to the International Space Station and is developing a Falcon capable of carrying astronauts to the station.
SpaceX officials say they identified all possible causes of the September 1 accident during pre-launch testing at Cape Canaveral Air Force Station, Florida, and took corrective action.

The accident destroyed the rocket and its payload, a satellite that Facebook wanted to use to spread internet access in Africa, and grounded the Falcon 9 programme as an investigation took place.
SpaceX announced this month that investigators concluded the accident involved a failure of one of the three helium tanks inside the rocket's second-stage liquid oxygen tank.
The investigation involved the Air Force, NASA, the National Transportation Safety Board and the Federal Aviation Administration, which issued a license for the launch.
The September accident was the second time a Falcon 9 was destroyed. In June 2015, a Falcon loaded with space station supplies disintegrated shortly after liftoff. SpaceX determined that a support strut broke.

The 10 satellites launched today are part of McLean, Virginia-based Iridium's project to replace its existing network of satellites that provide global voice and data communications.