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Not a very satisfying answer haha
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It even comments in the grimoire about Luna's new gravity and the Traveler's terraforming
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Terraforming and giving it an atmosphere and such doesn't change the mass of the planet though...
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It still changed the gravity somehow. If a moon-sized ball made of lead, neutronium, and electroweak matter can stay suspended in the air over a planet that weighs less than it does, I'd say it could change the gravity of the moon