Sir Isaac Newton was the first to determine that everything has its own gravitational force. He also believed that gravity was too weak to measure at anything lower than a planetary level. But without having a measurement of Earth's gravity, it would be impossible to calculate its weight, because gravity is variable. For example, if I stood on a bathroom scale on Earth, I'd weigh more than on the same set of scales on Mercury, a smaller planet than Earth with a lower gravitational force, even though my mass would remain the same.



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