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The earth is only 6 or so billion years old and even then, it had little atmosphere and was extremely hostile, eg completely molten with poisonous gases making up what atmosphere it had. And the sun's mass was larger 100 billion years ago, but there was no planet to affect. Also, the suns mass has nothing to do with is size. A dense star can have billions times more mass than the sun and be as small as the earth.
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