I am trying to find the easiest and simplest way of calculating the distance that two celestial bodies would need to be apart, in order for those celestial bodies to never get closer or further away from each other. I have the values of the mass, density, radius, volume and gravity of the two celestial bodies, is it possible to use the values I have to work out how far apart they would need to be to remain in a state of equilibrium? The smaller mass(M1) is orbiting around the larger mass(M2).(adsbygoogle = window.adsbygoogle || []).push({});

I tried to use the following equation, but to no avail because I neither have the gravitational force(F) nor do I have the radial distance (r) between the masses.

Newton's law of gravity: F = (M1 * M2) / r^12

I am looking for an equation that will help me to solve this problem for all planetary bodies.

Thanks for any and all help. Please keep answers as simple as possible :D

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Equilibrium between 1 stationary mass and 1 orbiting mass

**Physics Forums | Science Articles, Homework Help, Discussion**