Asteroids.js

var prefabExplosion : Transform;
//var scorekeeper : ScoreKeeper;

//function Start () {
//  scorekeeper = GameObject.FindObjectOfType(ScoreKeeper);
//}

function OnTriggerEnter (other:Collider) {
    if(other.gameObject.tag == "Bullet" || "Ship"){
        Debug.Log("you hit me");
        //scorekeeper.AddToScore();
        //Instantiate(prefabExplosion, transform.position, Quaternion.identity);
        Destroy(other.gameObject);
        Destroy(this.gameObject);
    }
}