how much does mercury planet weigh
it weighs 0 since it is levitated in space and is not affected by any sort of gravitation force other than it's orbit. The question you meant to ask was, what is the mass of the planet mercury. Weight is a measure of the gravity acting on objects. Since Mercury is in constant freefall, it has no weight. However, its mass is around 330,220,000,000,000,000,000,000 kilograms, that's 5.5% of Earth's mass. i know how much earth wieghs but not mercury.