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Gravity.

Earth does lose some light gases (such as Hydrogen and Helium) into space, but for the most part, Oxygen and Nitrogen are too heavy to escape Earth's gravitational pull.

Not true with Jupiter. Jupiter is so massive that it hoards all gases, including some 300 Earth masses' worth of Hydrogen.

Heat has a lot to do with it too. Even though the Sun is tremendously massive (332,000 times as heavy as the Earth), it is so hot from Hydrogen fusing at its core that the Sun blows off millions of tons worth of Hydrogen per second - resulting in the "Solar Wind".

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