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The moon's gravity is weaker than the Earth's. Because there is less gravity pulling on Professor Peabody, he has less weight.
Now he checks his mass.
His mass has stayed the same! Why do you think this has happened? Why did Professor Peabody's mass not change when the gravity changed?
His mass has stayed the same! Why do you think this has happened? Why did Professor Peabody's mass not change when the gravity changed?