SpaceX to try again to land reusable rocket on a ship

Elon Musk’s ambitions to corner the space cargo market via reusable rockets will stand a crucial test Sunday morning, when SpaceX engineers will attempt to guide a Falcon 9 rocket back to a ship off the Southern California coast.

Neither of the two previous attempts at a sea landing has succeeded, although the company brought a Falcon rocket stage back to Earth at Cape Canaveral, Florida, on Dec. 21.

Sunday’s effort is far more difficult. The full round trip has been compared to vaulting a pencil over the Empire State building, then getting it to come back and land on its eraser atop a floating target smaller than a shoe box, and not tip over.

The Falcon 9 two-stage rocket is scheduled to lift off from Vandenberg Air Force Base, California, around 10:40 a.m., carrying an Earth-observing satellite for U.S. and French government agencies. Its landing, off San Pedro a few minutes later, will be difficult to see with the naked eye, the company said.

SpaceX has yet to reuse a rocket stage, a key element in bringing the cost per launch to a level where the company could dominate the market for delivering cargo and people to space.

Physics, politics and economics all made the water landing necessary. Shortening the return trip was the easiest way to balance the requirements to deliver a heavy satellite at the high speed needed to reach a distant orbit, and then put on the brakes, flip the first stage around, guide it through Earth’s atmosphere, and get it to touch down gently on a barge measuring about 300 feet by 170 feet.