SpaceX launched a bouncy house to the International Space Station on Friday—and then successfully turned the first stage of its Falcon 9 rocket around, flew it back to Earth, and parked it on a drone ship floating 185 miles (300 kilometers) off the U.S. East Coast. It’s the first time anyone has done this, and it signals a step forward in making spaceflight significantly cheaper.

“The rocket landed instead of putting a hole in the ship, or tipping over, so we’re really excited about that,” said SpaceX founder Elon Musk at a press conference after the landing.

After launching from Cape Canaveral, Florida, the SpaceX rocket boosted its payload-carrying Dragon capsule toward low Earth orbit, then turned around and