Game Objects acting like magnets?

Alright so I have two spheres in my scene. They both have rigidbodys with gravity, no constraints, and they're not kinematic. They problem is that they slowly come together like magnets and the objective is to avoid the other spheres. So how do I turn off this "magnet effect"? I have the following scripts attached to one of my spheres, but not the other.

var level : int;

function OnCollisionEnter(theCollision : Collision)

{

if(theCollision.gameObject.name == "Goal")

{

Application.LoadLevel(level);

}

} ---------------new script-----------------

var level : int;

function OnCollisionEnter(theCollision : Collision)

{

if(theCollision.gameObject.name == "Enemy")

{

Application.LoadLevel(level);

}

}

-----------new script---------------

var target : Transform;

function Update ()

{

transform.LookAt(target);

}

---------new script-----------

var level : int;

function OnCollisionEnter(theCollision : Collision)

{

if(theCollision.gameObject.name == "Bottom")

{

Application.LoadLevel(level);

}

}