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  America remembers Challenger, 30 years on

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  How to use toilet in the space: Tim Peake explains

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  Happy holidays from space

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  Astronauts conduct spacewalk to repair ISS

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  Astronauts bite into first salad grown in space

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  Astronauts prep ISS 'parking spots' for space taxis

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  NASA's successful Orion launch opens new era in space

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  NASA counts down to Thursday spaceship test flight

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  Soyuz spacecraft blasts off to the International Space Station

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  Astronauts take first walk outside International Space Station

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  NASA to resume human space flight, focus on Mars

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