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How can you breath on earth whithout a space siut but you need one on other planets

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Gravity keeps the atmosphere down. Molecules, however minuscule, have mass and therefore are affected by gravity. Once you pass the top, there's nothing to breathe. It's like fish in the oceans, the water held to the earth by gravity - fish breathe fine in the ocean, but once they leave the water (aka we leave the atmosphere) they can't breathe anymore because there is no water.

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Because We Need Oxygen And Space Dont Have Oxygen... To Get Oxygen You Need Plants

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the atmosphere has enough oxygen in it for us to breathe

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Other planets don't have the oxygen level that we need. Besides, we've only ever been on the moon--not other planets.

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yet!
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Yet :D
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the atmosphere... and gravity...

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Earth has an atmosphere conducive to breathing. Other planets don't OR they have no atmosphere at all.

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you don't ''need'' one but if the conditions don't match the conditions on earth then you will need one and why you don't need one on earth is because the conditions are perfect for life

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Isn't that amazing? Maybe 'cause life evolved here to breathe our atmosphere.
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Lack of
Oxygen

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i agree with luck-duke.. lack of Oxygen

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