# How do we know the weight of the moon?

11 October 2009

## Question

How do we know how much the moon weighs?

## Answer

Dave - We know quite accurately because we've sent things to orbit around the moon and the speed at which something orbits around an object is related to its mass and you can do it with a load of maths and workout exactly how much it weighs.

## Comments

## Moon kilo

So how heavy is the moon!? "We know" is not really an answer

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