How to Add Distance in Revolute Joint?

How do I...?
#1

I want to add a distance between two objects while using the revolute joint, and then use motor settings, to simulate an object orbiting around another.
Lets say Object 1 is the planet and Object 2 is an asteroid circling around it. I want there to be a distance between the two.
Thank you!

#2

You can add animation

#3

How so? And will this increase the distance?

#4

I mean to say you can add animation of Planet earth is moving around the sun…and I didnt understand what distance problem you are having…