Archosaur

How is it possible that the strong nuclear force is directly proportional to distance?
How could all the atoms in the universe be so far apart if this were the case? The fact that I can't find an equation for the strong nuclear force makes me think it's just not that simple. Could someone tell me...
1. ...what property the strong nuclear force acts on?
2. ...what it's actual relationship to distance is?

I'm not a layman, but I obviously haven't taken much QM, so, I'd greatly appreciate details, but maybe hold the jargon, if possible.

Thank you much.