JSC2009-E-062602 (April 2009) --- Computer-generated artist?s rendering of the International Space Station as of April 6, 2009. Soyuz 17 (TMA-13) undocks from the Zarya nadir port, returning NASA astronaut Michael Fincke, Expedition 18 commander; cosmonaut Yury Lonchakov, Expedition 18 flight engineer; and U.S. spaceflight participant Charles Simonyi to Earth. Soyuz 18 (TMA-14) remains docked to the Zvezda Service Module?s aft port and Progress 32 supply vehicle remains linked to the Pirs Docking Compartment.