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NASA astronauts use a pen called the space pen that worked in extreme heat/cold and atmospheres from pure oxygen to vacuum. Using graphite is dangerous as it could break off the pencil and cause harm to both the astronaut and equipment

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Fun Fact: NASA astronauts use a pen called the ‘space pen’ that worked in extreme heat/cold and atmospheres from pure oxygen to vacuum. Using graphite is dangerous as it could break off the pencil and cause harm to both the astronaut and equipment

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nasa.gov

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