You know how you can balance a pencil on your finger? You do that by finding the center of gravity, but it’s really a demonstration in only one plane. The center of gravity in a more irregular object, like a big rock, is basically the same concept as the pencil, but in all three dimensions. It’s basically the point of balance in an object, which the result of how mass is distributed in that object.
The “center of gravity” isn’t like a place, like the center of the solar system. Your question text makes it sound like you think it is.
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