Cosmos refers to all the universes or multiverse and to a world order perceived as harmonious. Cosmology is a science that has its object of inquiry the origins, development, and structure of all the universes as an integrated entity, also known as astronomy. In cosmogony, a sub-field of astronomy, scientists believed that they concerned therein with issues such as the origins and development of celestial bodies and the questions according to birth of all the Universes. Stonehenge, a circle of standing stones in the south of England, served religious purposes as well as the observation of Sun and the Moon for centuries. The pyramids of Gizeh also exhibited considerable astronomical competence in the alignment of monuments. The ancient Greeks had developed the geocentric worldview, as in perspective, the Sun, the Moon, and the stars orbit around it. Components of this theory such as Pythagoras and Aristole encountered opposition already in their lifetimes. Nicolaus Copernicus established a heliocentric worldview, supported by scientific evidence. Galileo Galilei, who discovered the Galilean moons, and Johannes Kepler bulit theories of Copernicus and developed them further. Giordiano Bruno was the first scientist to argue that the universe is finite and that the stars are are other "suns". Most people suggested that human beings and their planet are not at the centre of the universe.