Asker's rating. 1  The moon is being pulled by the earth and that proves the there is a gravitational force between the two places. Therefore, the astronaut will never have absolutely zero weight at any point in between the earth and the moon. 2  There is no difference between an astronaut's mass on Earth and the moon. Mass is an intrinsic property of the object that does not change depending on location. What you're referring to is the difference in weight (which is mass times force of gravity). On the moon, the gravitational force is about 1/6 that on Earth so an astronaut's weight will be 1/6 of his/her weight on Earth. Weight and mass are generally used interchangeably because on Earth everyone is subjected to the same gravitational force, so it cancels out.