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The radius of 6378.1 km has enough gravity to hold this atmosphere in place and has a magnetic field strong enough to protect it.

1. My question is would mars have the same atmosphere and magnetic field if it were the same radius ((+/- 10% of earth)(not sure how to prove this out)) and had the same radius core ((+/- 10% of earth)(not sure how to prove this out))?

2. Would all bodies with this radius and mass ((+/- 10% of earth)(not sure how to prove this out)) and with enough energy from the parent star have life as we know it?

I think that would imply that the radius of earth is in direct correlation to life as we know it.

Please let me know if these idea are sound!

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# Planet Mechanics Question

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