Planet gravity code for Unity

GravityAttractor.cs

//************** REAL GAMES STUDIO ***************
//************************************************
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//************************************************

using UnityEngine;
using System.Collections;

public class GravityAttractor : MonoBehaviour {

    public float gravity = -9.8f;

    public void Attract(Rigidbody body) {
    
        Vector3 gravityUp = (body.position - transform.position).normalized;
        Vector3 localUp = body.transform.up;

​       // Apply downwards gravity to body
        body.AddForce(gravityUp * gravity);
        
        // Allign bodies up axis with the centre of planet
        body.rotation = Quaternion.FromToRotation(localUp,gravityUp) * body.rotation;
    }  
}

GravityBody.cs

//************** REAL GAMES STUDIO ***************
//************************************************
//realgamesss.weebly.com
//gamejolt.com/@Real_Game
//realgamesss.newgrounds.com/
//real-games.itch.io/
//youtube.com/channel/UC_Adg-mo-IPg6uLacuQCZCQ
//************************************************

using UnityEngine;
using System.Collections;

[RequireComponent (typeof (Rigidbody))]
public class GravityBody : MonoBehaviour {

    GravityAttractor planet;
    Rigidbody rigidbody;

    void Awake () {
    
        planet = GameObject.FindGameObjectWithTag("Planet").GetComponent<GravityAttractor>();
        rigidbody = GetComponent<Rigidbody> ();

        // Disable rigidbody gravity and rotation as this is simulated in GravityAttractor script
        rigidbody.useGravity = false;
        rigidbody.constraints = RigidbodyConstraints.FreezeRotation;
    }
    void FixedUpdate () {
    
        // Allow this body to be influenced by planet's gravity
        planet.Attract(rigidbody);
    }
}