//Damage the asteroid
void OnTriggerEnter2D(Collider2D collider)
{
AutoProjectile autoLaser = collider.gameObject.GetComponent <AutoProjectile> ();
if (autoLaser)
{
setHealth -= autoLaser.GetDamage();
autoLaser.Hit();
if (setHealth <= 0)
{
destroyAsteroid();
}
}
}
