trail renderer disapear, strange behavior

Am trying to make 2 falling stars.

When player hit a trigger area, the star move with some speed (- some aceleration). the stars are 2 planes with materials (particles/alpha blended multiply) and trail renderer

here is the code

 using UnityEngine;
 using System.Collections;
 
 public class control_cometa : MonoBehaviour {
     
     public GameObject cometa_estela;
     public bool movimiento=false;
     /*public float p_mov_x=1;
     public float p_mov_y=1;*/
     public float velocidad=10f;
     public float desaceleracion=2f;
     // Use this for initialization
     
     void Start () {
         cometa_estela.gameObject.active = false;
     }
     
     // Update is called once per frame
     void Update () {
         if(movimiento){
             cometa_estela.transform.Translate(Vector3.left * velocidad);
             velocidad -= desaceleracion;
             if(velocidad<0){
                 movimiento=false;
                 Destroy (cometa_estela);
                 Destroy (gameObject);
             }
         }
     }
     
     void OnTriggerEnter( Collider colison ){        
         if( colison.gameObject.tag == "jugador" ){            
             if(!movimiento){
                 //Debug.Log("mov");
                 cometa_estela.gameObject.active = true;
                  //StartCoroutine(mover_cometa());
                 movimiento=true;
             }
         }
     }
 }

The result is this: ![alt text][1] [1]: /storage/temp/4381-asdf.jpg

please show me how to see my star :D