Bailee is incorrect. The mass of the objects stays the same but weight will change.
Weight is the force exerted by gravity on an object, which depends on the gravitational pull of the celestial body (like the Earth or the Moon). On the Moon, the gravitational pull is weaker than on Earth, so an object's weight will be less on the Moon than on Earth. However, mass, which is a measure of the amount of matter in an object, remains constant regardless of location.