Smaller Diameter?
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This would result in a much weaker surface gravity
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As a result, too much water would escape the atmosphere along with other lighter gases
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Therefore, the atmosphere would be poisonous
Larger Diameter?
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This would result in much stronger surface gravity
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Too much ammonia and methane gas would persist in the earthÂ’s atmosphere
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Again, the earth's atmosphere would be poisonous
The Earth is just the right size to support life!