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What happened to the helium and hydrogen that made the atmosphere on the inner planets?

What happened to the helium and hydrogen that made the atmosphere on the inner planets?
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What happened to the helium and hydrogen that made the atmosphere on the inner planets?

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User Clementina
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the outer planets grew massive quickly enough to gravitationally hold on these gases before the solar wind dispersed the accretion disk, while the smaller inner planets did not
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User Beef
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