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Most of the atmosphere's gas never escapes the planet. Most of the gas in our atmosphere is from natural sources.

They do not escape and have never escaped.

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There is no atmosphere on the moon. Explain on the basis of escape velocity?

The moon's escape velocity is lower than the average velocity of gas particles in its atmosphere, so the moon cannot retain an atmosphere as the gas particles would escape into space. This is why the moon has no significant atmosphere.


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Why doesn't Earth's atmosphere extend completely out into space?

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