How do you simulate microgravity (Otherwise known as zero gravity)?

https://www.youtube.com/watch?v=QI-XQaLd-es I have tried to manipulate the gravity settings of my game objects to simulate microgravity and tried to use a JavaScript that controls gravity but nothing has worked so far. I would be most grateful if someone could give me some input for where to go. Thanks in advance.

var range : float = 30.0;

function FixedUpdate () { var cols : Collider[] = Physics.OverlapSphere(transform.position, range); var rbs : Array = new Array(); for (c=0;c