A wrestler weighs in for the first match on the moon. will the athlete weigh more or less on the moon than he does on Earth?

The moon is 1/4 the size of Earth, so the moon's gravity is much less than the earth's gravity, 83.3% (or 5/6) less to be exact. Finally, "weight " is a measure of the gravitational pull between two objects. So of course you would weigh much less on the moon.