Final answer:
Weight and mass are related concepts in physics. When an astronaut with a mass of 80 kg goes to the Moon, where gravity is weaker, their weight decreases compared to Earth.
Explanation:
Weight refers to the gravitational force acting on an object, while mass is the measure of the amount of matter in an object. When an astronaut with a mass of 80 kg on Earth goes to the Moon, where the gravitational acceleration is 1.6 m/s², their weight decreases. So, the astronaut's weight on the Moon would be 80 kg * 1.6 m/s² = 128 N.
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