Kirobo and Koichi Wakata talking inside the space station
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Japanese astronaut bids farewell to robot companion

13 May 2014 Last updated at 20:12 BST

Japanese astronaut Koichi Wakata is wrapping up his mission aboard the International Space Station.

He is leaving behind a mechanical friend, a humanoid robot named Kirobo, who has been his companion for the past six months.

The robot's makers claim it can process questions and construct answers without resorting to pre-programmed responses.

Tom Santorelli reports.