GameObject Fall Speed?

I would like for my star prefab to be able to faster as time passes by. It starts off slow and falls faster after one minute. How do I do it?

Add a rigidbody. Check use gravity. Watch.

IEnumerator forceCO()
{
float force = 5(whatever the value is)
while(true)
{
yield return new waitforseconds(1);

   add force to rigidbody..
   increment the force ..
   
   yield return null;
 }

You can actually scale the gravity on the rigid body of your star object.

(in update)
flightTime += Time.deltaTime;
rigidbody.gravityScale += flightTime*fTScale;

fTScale can be whatever you want just so you can tweak the rate at which the falling speed increases with time.