STS-117 was a space shuttle mission that launched on June 8, 2007, aboard the Space Shuttle Atlantis. The primary objective was to continue assembly and maintenance of the International Space Station (ISS) by delivering the second set of solar arrays and a new truss segment. During the mission, astronauts conducted three spacewalks to install the solar arrays and perform necessary repairs. STS-117 lasted 12 days, with the shuttle returning to Earth on June 22, 2007. This mission significantly enhanced the ISS's power capabilities and contributed to its ongoing construction.