Sitting in front of the Soyuz TMA-18 spacecraft are (from left) Tracy Caldwell Dyson, Alexander Skvortsov and Mikhail Kornienko. The three flight engineers will join the other Expedition 23 crew members already on the station. Credit: NASA/Victor Zelentsov
The three-member Expedition 23 crew will expand to six on April 4 when Flight Engineers Alexander Skvortsov, Tracy Caldwell Dyson and Mikhail Kornienko dock to the International Space Station in the Soyuz TMA-18 spacecraft. On April 7, space shuttle Discovery with the seven-member STS-131 crew will visit the orbiting laboratory and deliver science racks and ammonia tanks.