how to replicate gravity on a miniature planet

I'm making a game with a very small planet. I want this planet's gravity to perfectly reflect actual laws of physics, other than the fact that the planet shouldn't move. What I've got might be fine, but I'm unsure of whether I should use "time.deltatime" or normalize the direction and stuff like that. It would be great if someone could guide me in the right direction.

Code (CSharp):

1. public class Gravity : MonoBehaviour
2. {
3.  
4.     public float gravityForce = 10;
5.  
6.     void FixedUpdate()
7.     {
8.         Rigidbody[] rigBods = FindObjectsOfType<Rigidbody>();
9.         foreach (var i in rigBods)
10.         {
11.             i.useGravity = false;
12.  
13.             i.velocity += i.mass * (transform.position - i.position).normalized * gravityForce;
14.         }
15.     }
16. }

 

you're off to a good start I guess, but rather than changing the velocity, just add an acceleration to the rigidbody so you don't have to worry about Time.deltaTime, Time.fixedDeltatime, Time.unscaledDeltaTime, Time.doubleTime, Time.hammerTime:

i.AddForce(transform.position - i.position).normalized * gravityForce, ForceMode.Acceleration);

However, the gravity should get less, the further away from the planet you go. But this might already be overkill.

 

Thankyou so much i cant believe i missed this notification by a whole week