Members of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew, from left: ESA astronaut Andreas Mogensen, Roscosmos cosmonaut Sergei Volkov and Kazakhstan's cosmonaut Aidyn Aimbetov after planting trees at the Gagarin Cosmonaut Training Center in Baikonur.

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Members of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew ESA astronaut Andreas Mogensen, left, and Roscosmos cosmonaut Sergei Volkov plant a tree at the Gagarin Cosmonaut Training Center in Baikonur.

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Members of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew Kazakhstan's cosmonaut Aidyn Aimbetov, left, and Roscosmos cosmonaut Sergei Volkov plant a tree at the Gagarin Cosmonaut Training Center in Baikonur.

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Members of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew, from left: Kazakhstan's cosmonaut Aidyn Aimbetov, Roscosmos cosmonaut Sergei Volkov and ESA astronaut Andreas Mogensen play chess at the Gagarin Cosmonaut Training Center in Baikonur.

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Kazakhstan's cosmonaut Aidyn Aimbetov, a member of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew, at the Gagarin Cosmonaut Training Center in Baikonur.

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ESA astronaut Andreas Mogensen, a member of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew, at the Gagarin Cosmonaut Training Center in Baikonur.

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Roscosmos cosmonaut Sergei Volkov, a member of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew, at the Gagarin Cosmonaut Training Center in Baikonur.

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From left: Roscosmos cosmonauts Sergei Prokopyev and Oleg Skripochka with ESA astronaut Timothy Peake, members of the ISS long-term Expedition 45/46 and Visiting Expedition 18 backup crew, with Kazakhstan's cosmonaut Aidyn Aimbetov, Roscosmos cosmonaut Sergei Volkov and ESA astronaut Andreas Mogensen, members of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew, at the Gagarin Cosmonaut Training Center in Baikonur.

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Members of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew, from left: Kazakhstan's cosmonaut Aidyn Aimbetov, Roscosmos cosmonaut Sergei Volkov and ESA astronaut Andreas Mogensen at the Gagarin Cosmonaut Training Center in Baikonur.

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Members of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew, foreground from left: Kazakhstan's cosmonaut Aidyn Aimbetov, Roscosmos cosmonaut Sergei Volkov and ESA astronaut Andreas Mogensen at the Gagarin Cosmonaut Training Center in Baikonur.

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Members of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew, foreground from left: Kazakhstan's cosmonaut Aidyn Aimbetov, Roscosmos cosmonaut Sergei Volkov and ESA astronaut Andreas Mogensen during training at the Gagarin Cosmonaut Training Center in Baikonur.

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Kazakhstan's cosmonaut Aidyn Aimbetov, center, a member of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew, during training at the Gagarin Cosmonaut Training Center in Baikonur.

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ESA astronaut Andreas Mogensen, left, a member of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew, during training at the Gagarin Cosmonaut Training Center in Baikonur.

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Roscosmos cosmonaut Sergei Volkov, left, a member of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew, during training at the Gagarin Cosmonaut Training Center in Baikonur.

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Members of the ISS long-term Expedition 45/46 and Visiting Expedition 18 primary crew: Kazakhstan's cosmonaut Aidyn Aimbetov, second left, and ESA astronaut Andreas Mogensen, second right, during training at the Gagarin Cosmonaut Training Center in Baikonur.

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