This page explores weightlessness in outer space and its effects on astronauts' bone health. It clarifies the difference between mass, a constant measure of matter, and weight, which is influenced by ...This page explores weightlessness in outer space and its effects on astronauts' bone health. It clarifies the difference between mass, a constant measure of matter, and weight, which is influenced by gravity. The text also mentions that weight is less on the moon than on Earth, while mass stays the same regardless of location. Additionally, it gives a brief explanation of how to measure mass and weight.