'Permanent bone loss': Calgary study finds astronauts suffer on return to Earth

'Permanent bone loss': Calgary study finds astronauts suffer on return to Earth

FILE - Canadian astronaut Robert Thirsk talks with students from Rockcliffe Elementary School as they get a first look at The Living In Space exhibit during its unveiling at the Canadian Aviation and Space Museum in Ottawa on Thursday, May 12, 2011. (THE CANADIAN PRESS/Sean Kilpatrick) FILE - Canadian astronaut Robert Thirsk talks with students from Rockcliffe Elementary School as they get a first look at The Living In Space exhibit during its unveiling at the Canadian Aviation and Space Museum in Ottawa on Thursday, May 12, 2011. (THE CANADIAN PRESS/Sean Kilpatrick)

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