In everyday conversation, and even on our site, we treat the terms mass and weight like synonyms. But scientifically, the two are related but very separate. The mass of an object is an intrinsic ...

Your weight changes on other planets and moons due to different gravitational pulls. Weight is how much gravity pulls on you; mass (amount of matter) stays the same. Newton's Law of Gravitation ...

Earth’s mass is about 6 million million million million kilograms, say our readers – and it wouldn’t be a great idea to be in the vicinity if too much mass were added Let’s start by realising that ...