HOUSTON - After several months working aboard the International Space Station, NASA astronaut Suni Williams will come back to Earth aboard the space shuttle Atlantis, targeted for launch June 8. That shuttle mission, STS-117, will carry her successor, astronaut Clay Anderson, to the station to begin his duty as an Expedition 15 flight engineer.

The exchange of Anderson and Williams was originally planned for the STS-118 mission, now targeted for launch in August. However, that flight, first set to fly in June, had to be postponed after an unexpected hail storm damaged Atlantis' external fuel tank and delayed STS-117.