At one time, it was believed that the______________was in the center of our Solar System. The ________________ and ___________ orbited around the ______________. This theory was known at the______________theory. The _____________theory stated that the Solar System was ______ centered. It was many years later that another theory was developed and it stated that the __________was in the center of our Solar System. The _________and the __________ orbited around the _________. This theory stated that our Solar system is ________ centered.
