# Moon exchange particle

## Homework Statement

If an exchange particle held the moon together, what would the mass of the exchange particle be?

## Homework Equations

Well, I know that the range of an exchange particle is as follows: $R=\frac{\hbar}{2mc}$ where m is the mass of the exchange particle and c is speed of light, hbar is 1.054e-34.

## The Attempt at a Solution

I do not fully understand what a range is....how can I apply a range to this problem? If I could figure that out, i think I would be able to figure the problem out