Instantiating class creating copies with same instance ID of 0

The function below is supposed to create a new instance of SolarSystem_Manager and add it to a list however when var clone = Instantiate(_solar) is run, it returns a nullreference error. All instances of _solar have the same ID when I created multiple and t$$anonymous$$s was 0 and changing the variables of one also changes the variables of the others. Do you know what I am doing wrong?

 private void createSolarSystem()
         {
             SolarSystem_Manager _solar = new SolarSystem_Manager();
             _solar.solarSystem = new SolarSystem(transform.GetComponent<Galaxy>(), Random.Range(9, 10), new List<LQPlanetManager>(), new SunManager());
             var clone = Instantiate(_solar);
             solarSystems.Add(clone);
         }