A trio of international astronauts returned to Earth Monday after 166 days in space, bringing the Olympic torch back to the planet after a historic space walk in space. Russian cosmonaut Fyodor Yurchikhin, NASA astronaut Karen Nyberg and Italian Luca Parmitano, who had been aboard the International Space  Station, descended in the Soyuz capsule to touch down at 0249 GMT on the frosty steppes of Kazakhstan.