Astronaut Ron Garan participated in the first of STS-124's three planned spacewalks as construction and maintenance continue on the International Space Station. During the six-hour, 48-minute spacewalk, Garan and fellow astronaut Mike Fossum loosened restraints holding the Orbiter Boom Sensor System in its temporary stowage location on the space station's starboard truss, prepared the Kibo Japanese Pressurized Module for its installation to the space station, demonstrated cleaning techniques for the Solar Alpha Rotary Joint's (SARJ) race ring and installed a replacement SARJ Trundle Bearing Assembly. Kibo was officially opened during a ceremony performed by astronaut Akihiko Hoshide and the Expedition 17 and STS-124 crews the next day.