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The gaseous envelope surrounding the *Earth*, and retained by the Earth's gravitational field. If your question is about the atmosphere on another celestial body or is more astronomy related, please ask on Astronomy.SE.
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Amount of Earths water with consideration to space travel?
Everyone always says that there has always been, and always will be, the same amount of water on planet Earth.
What about space travel?
They obviously need water in space, so they must take it up wi …