ISS Expedition 43 Farewell, Hatch Closure and Undocking from the International Space Station.

NASA’s Terry Virts and Flight Engineers Samantha Cristoforetti of ESA (European Space Agency) and Anton Shkaplerov of Roscosmos undocked their Soyuz TMA-15M spacecraft from the International Space Station to return back to Earth and land in Kazakhstan.  Their return wraps up 199 days in space, during which they traveled more than 84 million miles since their launch from the Baikonur Cosmodrome in Kazakhstan on Nov. 24. Their return date was delayed four weeks to allow Roscosmos to investigate the cause of the loss of the un-piloted Progress 59 cargo ship in late April.