SpaceX launched more than two tons of cargo to the International Space Station and also conducted an experiment in rocket recovery.

The companys Falcon 9 rocket lifted off into the cloudy skies over Cape Canaveral Air Force Station at 3:25 p.m. ET, sending a robotic Dragon cargo capsule into orbit.

The Dragon held nearly 5,000 pounds (2,200 kilograms) of supplies and equipment for the station, ranging from the legs for a space robot to a lettuce-growing experiment. This is the third cargo delivery under the terms of SpaceX's 12-flight, $1.6 billion contract with NASA.

In addition to sending up the Dragon, SpaceX tested a landing system that could make it possible for future Falcons to return autonomously to a landing pad for reuse.

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The Falcon's first stage was prepped to fire its engines for a soft splashdown and recovery from the Atlantic. SpaceX CEO Elon Musk said in a pre-launch tweet that heavy seas were keeping the recovery ship from reaching the anticipated splashdown zone.

After the launch, Musk reported via Twitter that the first stage executed a good re-entry burn and was able to stabilize itself on the way down. However, the rough seas were a problem. "I wouldn't give high odds that the rocket was able to splash down successfully," he said.

Later updates were more positive: "Data upload from tracking plane shows landing in Atlantic was good! Several boats enroute through heavy seas," Musk tweeted. "Flight computers continued transmitting for 8 seconds after reaching the water. Stopped when booster went horizontal."

Recovering and reusing rockets are key parts of Musk's strategy for reducing the cost of spaceflight and eventually sending colonists to Mars. The South African-born Musk, whose net worth is estimated at more than $9 billion, is in charge of SpaceX as well as the Tesla electric-car company and the Solar City power-generation venture.

Success after weeks of delay

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SpaceX Launches Cargo to Space Station and Tries Rocket Recovery