How do I rotate my feet to gravity

I'm making a space game and I'm using this code for gravity to my planet. public GameObject attractedTo; public float strengthOfAttraction = 5.0f;

     void FixedUpdate ()
     {
         Vector3 direction = attractedTo.transform.position - transform.position;
         transform.position += direction * strengthOfAttraction * Time.deltaTime;
     }

How can I make my characters feets always face down, to the planet?

I've tried with .lookAt(); and transform.rotation