An anonymous reader writes: The SpaceX Dragon cargo ship which launched from Cape Canaveral on Friday delivered the world's first inflatable room for astronauts. It arrived at the ISS on Sunday after station astronauts used a robot arm to capture the Dragon, orbiting 250 miles above Earth. The compartment should swell to the size of a small bedroom once filled with air next month. It will be attached to the space station this Saturday, but won't be inflated until the end of May. NASA envisions inflatable habitats in a couple decades at Mars, while Bigelow Aerospace aims to launch a pair of inflatable space stations in just four years for commercial lease. Bigelow Expandable Activity Module (BEAM) will be restricted from the six on-board astronauts while NASA tests the chamber to see how it performs. The rocket used to launch the cargo ship successfully landed on a floating drone ship for the first time ever. It was the second time SpaceX successfully landed one of its rockets post-launch; the first time was in December, when the company's Falcon 9 rocket touched down at a ground-based landing site at Cape Canaveral, Florida, after putting a satellite into space.