Why do astronauts appear to bounce when they are on the moon? Well there is a simple explanation. Gravity. The moon has 80 times less mass than Earth and the moon's gravity is about 1/4 as strong as the earth's gravity. So when astronauts “walk” on the Moon, it appears as bouncing or hopping because of the lack of gravity humans are used to.
Answer:The moon's gravity is about 1/4 as strong as the earth's gravity. Our muscles a built to carry us on the earth. The astronauts are used to walking on earth so when they push forward with their legs they tend to use the same amount of energy which is 4 times more than needed.
