Access variables, objects in array in another script?

Sorry if the title seems confusing but I've either really overcomplicated things or i'm just doing something very stupid....anyway, here goes.

Basically what i'm trying to do is plot where a planet is in the solar system by ways of using it's semi major axis, mass etc. Now these values are in one script called "Planet" which contains the values

name, mass, semiMajorAxis, inclination, avgSpeed

with functions to return these named Getmass(), GetsemiMajorAxis() etc etc

In another script I have named "Kepler Coords", I have an array called "planet", now this array contains prefab spheres with teh "Planet" script attached to them with the values filled in, In the "Kepler Coord" script I need to be able to access the variables of the "Planet" script, however try as I may I am getting no joy.

here is part of the "Kepler Coord" script,

 var planet : GameObject[];
 var planetScript : Planet;
 
 function Awake ()
 
 {
     var planet = GameObject.FindGameObjectsWithTag("planet");
     
 }
 
 private function BuildSystem ()
 
 {
     bodies = new GameObject[(planet.length -1)];
     
     for (var i : int = 0; i<planet.length; i++)
         {
             var tMass : float = mass * massConversion;
             mass += tMass;
             
             var tRadialDistance   : float = semiMajorAxis * distanceConversion;
             var tInclinationAngle : float = inclination * ((2.0*Mathf.PI) / 360);
             var tPositionX        : float = tRadialDistance * Mathf.Cos (tInclinationAngle);
             var tPositionY        : float = tRadialDistance * Mathf.Sin (tInclinationAngle);
             var tPosition         : Vector3 = new Vector3 (tPositionX, 0.0, tPositionY);
             
             var tVelocityZ : float = avgSpeed * (distanceConversion/timeConversion);
             var tVelocity  : Vector3 = new Vector3 (0.0, tVelocityZ, 0.0);
             
             var tBody : GameObject = Instantiate(planet, tPosition, Quaternion.identity);
             
             
             tBody.rigidbody.mass = tMass;
             tBody.rigidbody.velocity = tVelocity;

As you can see I need to access the variables from the "Planet" script, but whenever i try planet.GetComponent("mass") or planet.GetComponent(GetMass()) or planet.GetComponents("mass") etc I keep getting an error saying that "GetComponent is not part of GameObject[]".

Any help would be much appreciated as I'd rather not go down the XML route since I have no understanding of it.