Watch trailer for 'Space: The Longest Goodbye,' new film exploring astronaut mental health (video)

Scientists and mission planners are investigating how long-term space travel affects the human mind and body, as they work to get astronauts ready to make the big leap to Mars.

The mental aspects — the feelings of loneliness, isolation and solitude that could come with a multiyear space mission — are increasingly coming under the microscope, as an award-winning new documentary shows.

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