Another success for SpaceX rocket

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SpaceX landed one of its rockets on an offshore platform Friday, the third time in two months the private space exploration firm has made a successful landing at sea.

CAPE CANAVERAL, FL - APRIL 8: In this handout provided by the National Aeronautics and Space Administration (NASA), SpaceX's Falcon 9 rocket makes its first successful upright landing on the 'Of Course I Still Love You' droneship on April 8, 2016 some 200 miles off shore in the Atlantic Ocean after launching from Cape Canaveral, Florida. (Photo by NASA via Getty Images)

CAPE CANAVERAL, FL – APRIL 8: In this handout provided by the National Aeronautics and Space Administration (NASA), SpaceX’s Falcon 9 rocket makes its first successful upright landing on the ‘Of Course I Still Love You’ droneship on April 8, 2016 some 200 miles off shore in the Atlantic Ocean after launching from Cape Canaveral, Florida. (Photo by NASA via Getty Images)

The unmanned Falcon 9 rocket sent a Thai communications satellite into orbit Friday from Cape Canaveral Air Force Station in Florida. Then, the first-stage booster landed on the deck of a drone ship off Florida.

Most first-stage boosters that have carried people or satellites to space over the past 58 years have been discarded after their launch, often burning up upon re-entry.

But landing rockets upright is crucial to cutting the cost of space travel, since they can be reused.

SpaceX, founded by Elon Musk, repeated a success made earlier this month when it launched its latest Falcon 9 rocket from Cape Canaveral.

The company’s first successful sea landing was made April 8.

After three failed attempts to land a rocket upright on a platform at sea, SpaceX successfully landed one of its Falcon 9 rockets on solid ground after a launch from Florida’s Cape Canaveral Air Force Station in December.