public override void collisionCheck(spaceObject obj)
        {
            if (this == obj)
                return;

            if (obj is spaceObjectHasList)
            {
                locations = (obj as spaceObjectHasList).getList();
                for (int i = 0; i < locations.Count(); ++i)
                {
                    if ((globCenterX - locations[i].posX) * (globCenterX - locations[i].posX) + (globCenterY - locations[i].posY) * (globCenterY - locations[i].posY) < colRadius * colRadius + obj.colRadius * obj.colRadius)
                    {
                        collide();
                        (obj as spaceObjectHasList).collide(locations[i]);
                    }
                }
            }
            else
            {
                if ((posX - obj.posX) * (posX - obj.posX) + (posY - obj.posY) * (posY - obj.posY) < colRadius * colRadius + obj.colRadius * obj.colRadius)
                {
                    collide();
                    obj.collide();
                }
            }
        }
 public override void collisionCheck(spaceObject obj)
 {
     base.collisionCheck(obj);
 }
 public virtual void collisionCheck(spaceObject obj)
 {
 }