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Sir [[Isaac Newton]] was an English [[scientist]] who lived from 1634 to 1727.  He was a physicist, astronomer, mathematician, alchemist and natural philosopher.  He is probably best known for his Theory of Universal Gravitation and his Laws of Motion.  His contributions also include inventing the reflecting telescope, developing [[calculus]] simulatneously with german physicist Gottfried Leibniz. Bothe accused each other of plagiarism, but neither could prove it.<ref>Newton Biography[http://scienceworld.wolfram.com/biography/Newton.html]</ref>), and numerous other contributions to his fields of study.   

Sir [[Isaac Newton]] was an English [[scientist]] who lived from 1634 to 1727.  He was a physicist, astronomer, mathematician, alchemist and natural philosopher.  He is probably best known for his Theory of Universal Gravitation and his Laws of Motion.  His contributions also include inventing the reflecting telescope, developing [[calculus]] simultaneously with German physicist Gottfried Leibniz. Each accused the other of plagiarism, but neither could prove it.<ref>Newton Biography[http://scienceworld.wolfram.com/biography/Newton.html]</ref>), and numerous other contributions to his fields of study.   

Newton was the first to demonstrate that the same laws that govern the motion of celestial objects also govern the motion of things on Earth.  Newton contributed greatly to the advancement of science.  His work also advanced the concept of heliocentrism (the belief that the Sun is at the center of the solar system).

Newton was the first to demonstrate that the same laws that govern the motion of celestial objects also govern the motion of things on Earth.  Newton contributed greatly to the advancement of science.  His work also advanced the concept of heliocentrism (the belief that the Sun is at the center of the solar system).

== Gravity ==

== Gravity ==

Newton developed the theory of universal gravititation, more commonly known as gravity, when, according to an urban legend, an apple struck him on the head. He realized that the same force pulled the apple to the ground, as kept Jupiter's moons in orbit. His theory stated that all matter is attracted to matter by a force, whose strength increases proportionally to the mass of the objects involved, and inverse proportionately to the distance between them. The theory's accuracy was later improved by Albert Einstein's theory of relativity.

Newton developed the theory of universal gravitation, more commonly known as gravity, when, according to an urban legend, an apple struck him on the head. He realized that the same force pulled the apple to the ground, as kept Jupiter's moons in orbit. His theory stated that all matter is attracted to matter by a force, whose strength increases proportionally to the mass of the objects involved, and inverse proportionately to the distance between them. The theory's accuracy was later improved by Albert Einstein's theory of relativity.