The mass of the astronaut is the same in both places. However, the weight is different due to the variation of gravity.
Weight is a term that refers to the force with which the Earth or another celestial body attracts a body due to the action of gravity. It is measured in Newtons.
Mass is a term that refers to a physical magnitude and general property of matter that expresses the inertia or resistance to the change of movement of a body. It is measured in kilograms.
The weight of a body is not the same on Earth as on the Moon because the Moon is smaller and the force of gravity is less. Therefore, the weight of the astronaut will vary depending on the gravity with which he is attracted to the center.
On the other hand, the mass of the body does not vary even if the astronaut is in different places such as the Earth or the Moon, because he will always occupy the same space.
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