ESA astronaut Frank De Winne safely back on Earth   Soyuz capsule on landing zone.   Soyuz TMA-15 crew: Frank De Winne (bottom), Roman Romanenko (left) and Bob Thirsk (right)   ISS021-E-028096 (17 Nov. 2009) --- European Space Agency astronaut Frank De Winne, Expedition 21 commander, works with the RadSilk experiment in the Kibo laboratory of the International Space Station. RadSilk examines the effects of radiation exposure in microgravity on silkworms.   Crew patch that will be worn by Russian cosmonaut Roman Romanenko, ESA astronaut Frank De Winne and Canadian Space Agency astronaut Robert Thirsk for their flight to the International Space Station with the Soyuz TMA-15 spacecraft. Romanenko, De Winne and Thirsk are set to spend six months living and working on the ISS as members of the Expedition 20 and 21 crews. The Soyuz TMA-15 is scheduled for launch on 27 May 2009. Release date: 1 December 2009