The giant impact theory is a theory on how a mars sized object struck earth and debris from earth formed the moon. This theory is the best theory due to how good the evidence surrounding it is. Scientist have been praising this theory because of how logical it is compared to the fission theory or the sister theory. The fission theory makes no sense as the earth couldn't have moved faster significantly and that's how the moon formed. That theory makes no sense. The sister theory has its flaw because if the moon and earth were formed at the same time, then the moon and earth would be very similar in terms of interior. The capture theory also isn't a good enough theory on the moon because although Saturn and Jupiter can attract moons and capture
