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For over 50 years CTV National News has been Canada's most-watched national news program, covering the stories that matter to Canadians. Watch at 10 p.m. ET on CTV News Channel and CTVNews.ca and at 11 p.m. ET on CTV, the CTV News app and CTVNews.ca

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How the lack of gravity in space impacts astronauts’ brain

What happens to the brain when you take gravity away? According to a new study looking at astronauts both before and after space travel, that experience causes physical changes that researchers believe requires at least three years between longer missions to recover from.

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