Answer:
Their weight.
Explanation:
Weight is the measurement of gravity pushing you down, so with less gravity there would be less weight.
The astronauts expect their weight to be different on the Moon
Weight is simply defined as the gravitational pull of the earth on an object. It is measured in Newton.
The weight of an object varies with location because of gravity.
The weight of an object is related to it's mass according to the following equation:
Weight = mass × Acceleration due to gravity
Since the gravity of the Moon is lesser than that of the Eearth, the astronauts certainly knew that their weight will be different on the Moon.
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