public void Attract(Transform body)
{
world = worldGO.GetComponent("GenerateWorld") as GenerateWorld;
Vector3 gravityUp = (body.position - CalculateCenterOfWorld(world.GetSizeWorld())).normalized;
Vector3 localUp = body.up;
body.GetComponent <Rigidbody>().AddForce(-gravityUp * gravity);
body.rotation = Quaternion.FromToRotation(localUp, gravityUp) * body.rotation;
}