Earth is protected by a magnetic field. Not only does it shield life from solar radiation, it also guides animals to their migratory grounds. But here's the thing, according to Universe Today:

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> The core probably accounts to 42% of Mercury’s volume, while Earth is just 17%.
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So let's say we have found an alternate Earth in an alternate universe where Earth's core makes up 42% of its volume rather than the 17% ours has. Would this larger volume of core give Earth a far stronger magnetic field?