Their weight changed but their mass didn't. The moon is smaller than the Earth and has a weaker gravitational pull and makes you weigh lighter. Your weight on the Moon is 16.5% what you would experience on Earth. Mass never changes.
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In 1969, humans landed on the moon for the first time, the astronaut's weight changed because there is a difference in the gravity of the earth and the moon, but the mass of the astronaut does not change because mass is the content of matter and it is independent of the variation in gravity
It can be defined as the force by which a body attracts another body towards its center as the result of the gravitational pull of one body and another,
The mass of an amount remains constant throughout all planets in the cosmos, but its weight varies depending on the gravity of each one.
Thus, When humans first set foot on the moon in 1969, the astronaut's weight changed due to the difference in the gravitational pull between the earth and the moon, but the astronaut's mass did not change because mass is the component of matter and is unaffected by changes in gravity.
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