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What makes the Earth's air breathable is its density and oxygen content. The atmosphere is held by Earth's gravity and is the thickest at the surface, where we are. As you get higher in altitude (Denver, for example), the air is thinner and less oxygen is available. By the time you reach 8,000 meters (about the height of Mount Everest), you would need to bring your own oxygen in order to survive. Above around 50,000 to 70,000 meters, there is almost no air pushing down to provide pressure and dense, breathable air. It is a near-vacuum like the rest of outer space.

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16y ago

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