Sergey Nikolayevich Ryazansky (Russian: Серге́й Николаевич Рязанский; born November 13 1974) is a Russian cosmonaut. He was selected as commander of the IMBP-6 cosmonaut group in 2003 but later transferred to the TsPK Cosmonaut Group. Ryazansky made his first spaceflight aboard the Soyuz TMA-10M/Expedition 37/Expedition 38 mission from September 2013 until March 2014.
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