most educated people who studied the world took guidance from the explanations given by authorities like ancient Greek writers and Catholic Church. The common held belief for a long time was that the Earth was the centre of the universe and that all the planets revolved around it. This is because God had created the universe and humans were children of God, therefore it follows that the Earth should be the center of the universe. We now have more powerful data analysis techniques, more sophisticated equipment for making observations and running experiments, and a much greater breadth and depth of scientific knowledge