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Lanza Matilde Silvestri Christian Zhang Lai Tai media type="custom" key="18978322"

**Geocentric Theory**

 * Nicolas Copernicus (1473-1543) went back to the ideas of the ancient Greeks. He said the center of the solar system isn't the earth, but is the sun. He also wrote that all the planets and the earth orbit the sun and he believed that the orbit is in the shape of an elipse with the sun at its center.**

Universe

 * The first ancient people who studied the universe were the Greeks. In fact, our word astronomy comes from two Greeks words meaning "Law and Order". Their research work and their ideas were very important for the Romans too.**

=**S**olar System=
 * The Solar System is made up of all the planet that orbit ur Sun. The Solar System also consists of moons, comets, astroids, minorplanets, dust and gas. Everthing in the Solar System orbits around the Sun. The larger an object is, the more gravity it has. Because the Sun is so large, its powerful gravity attracts all the other objects in the Solar System towards it.**
 * The Solar System is made up of nine planets: Mercury, Venus, Eath, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto, but it is not a planet anymore because it is too small.**
 * Scientists believe that the Solar System evolved frow a giant cloud of dust and gas that we call nebula.**

=Concentric System=
 * Around 150 A.D Ptolemy, an astronomers from Alexandria. He wrote that the Earth, and not the sun, was at the centre of the universe; he also said that the planets, the stars, the moon moved around the Earth. In other words we can say he invented the concentric system. Most people used to believed his theory until 1543.**
 * From about 300 BC to 476 AD people were not very interested in the study of astronomy because they preferred astrology so some of the works of the Greek philosofers were destroyed.**