A crowd of shuttle workers，reporters and schoolchildren waited to greet Discovery at Kennedy Space Center in Cape Canaveral，Florida.Three minutes before noon，they watched as the shuttle appeared in the sky and made one last touchdown.“For the final time：wheels stop，” Discovery’s commander Steven Lindsey said when the shuttle rolled to a stop.

　　Discovery’s final trip was to the International Space Station (ISS)，a giant space lab in the sky.Since 1998,16 nations have been working together to build the space base 220 miles above Earth.Discovery’s crew took care of the last U．S. construction project at ISS.They delivered 10 tons of supplies for the ISS.

　　The six­person crew also dropped off an unusual companion for ISS’s researchers：a humanoid，or human­like，robot named Robonaut 2.Astronauts will assemble (组装) R2 at the ISS over several months.R2 was specifically designed to help astronauts perform basic tasks in space.

　　Including the 13­day final mission，Discovery has spent a total of 365 days in space and has traveled a whopping 148 million miles since 1984.“It came back as perfect on its final flight as it did on its first flight，”Lindsey said.

　　After 30 years，NASA is winding down its shuttle program.NASA is to begin work on new spaceships that can travel longer distances.Discovery’s retirement is the first of three.Endeavor，another shuttle，is scheduled to make its final voyage soon.And Atlantis’s last trip is planned for the end of June.

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