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Ptolemy
Claudio Ptolemy was an Astronomer i geographer. Ptolemy proposed the geocentric system as base of the celestial mechanics that lasted for more than 1400 years. Its theories and astronomical explanations dominated the scientific thought until the XVI th century. -
Feb 19, 1473
Copernicus
Nicolau Copérnico, was a Polish astronomer, known for his heliocentric theory which had already been described by Aristarchus of Samos, according to which the Sun was at the center of the universe and the Earth, which revolved once per day on its axis, completed each year a return to your environment. -
Feb 15, 1564
Galileo
Galileo Galilei was supporting that the Earth was turning about the Sun, what was contradicting the belief of which the Earth was the center of the Universe. Together with Kepler, it began the scientific revolution that culminated with the work of Isaac Newton. Its main contribution to the astronomy was the use of the telescope for the observation and discovery of the solar spots, vales and lunar mountains, the four biggest satellites of Jupiter and the phases of Venus. -
Dec 27, 1571
Kepler
Johannes Kepler was born in Leonberg, Germany. According to his first law, the planets revolve in orbits elliptical with the Sun at a focus. The second, or ruler of the area, says that an imaginary line from the Sun to a planet travels an ellipse equal areas during equal time intervals. In other words, a planet rotates faster as closer is the Sun. -
Newton
Isaac Newton was born at Woolsthorpe, Lincolnshire, England. Newton showed that the gravitational force decreases as the square of the distance and that this gives rise to the laws of Kepler of planetary motion.So that explained the Law of Universal Gravitation. -
Edwin Hubble
Edwin Powell Hubble was an astronomer and cosmòleg North American, He Discovered the expansion of the universe and estimated its size and age, although its contribution to the knowledge of the universe is much wider and goes beyond this idea.
