A private company succeeded Friday in landing a rocket upright at sea for the first time in history.
SpaceX, which handles cargo launches for the International Space Station, said on its Twitter feed that the first stage of a Falcon 9 rocket that had lifted the Dragon cargo capsule to orbit had landed on a floating barge.
The company posted a video of the landing on its Twitter feed.
President Obama congratulated SpaceX in a message posted to his official Twitter feed, as did NASA.