SpaceX Launches a Satellite With a Partly Used Rocket

A commercial flight employing a reused rocket is a stride toward reducing the cost of sending payload to space, for business ventures like satellite companies in particular. For Elon Musk, the founder and chief executive of SpaceX, replicating this flight with reusable rockets on a regular basis would be a crucial step toward his dream of sending people to Mars.


A Falcon 9 rocket after a successful launch at the Kennedy Space Center.


“It means you can fly and refly an orbital class booster, which is the most expensive part of the rocket,” Mr. Musk said.

Until now, almost all rockets have been single use. Once the fuel is spent, a rocket stage plummets to Earth, a quick demise to a complex machine that cost tens of millions of dollars to build.

Mr. Musk has likened that to scrapping a 747 jet after one flight.

The booster for Thursday’s flight had been part of the rocket that carried cargo supplies to the International Space Station for NASA last April. As the rocket’s second stage and cargo capsule continued to orbit, the booster steered itself back and set down on the floating platform, which is playfully named “Of Course I Still Love You.”

After the platform returned to port in Jacksonville, Fla., the booster was refurbished, tested and deemed ready for another flight. SES, the company that owns and operates the satellite launched Thursday, was the first commercial customer for a Falcon 9 in 2013, and it signed up for the first flight with a recycled booster at a discount from the usual $62 million launch price. Neither SES nor SpaceX has publicly said how large the discount was.

Mr. Musk has suggested that rocket launches could eventually be much cheaper because the cost of rocket propellants is less than 1 percent of the full price for…

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