During his lifetime Newton developed the theory of gravity, the laws of motion which became the basis for physicsa new type of mathematics called calculus, and made breakthroughs in the area of optics such as the reflecting telescope.

The gradual evolution of Newton's thought over these two decades illustrates the complexity of his achievement as well as the prolonged character of scientific 'discovery.

Bibliography Cohen, I. In later years he supervised two updated versions of the Principia, he carried on a correspondence with scientists all over Great Britain and Europe, he continued his study and investigation in various fields, and, until his very last years, he performed his duties at the Mint.

Of perhaps equal importance, Newton also demonstrated that the colors of the spectrum, once thought to be qualities, correspond to an observed and quantifiable 'degree of Refrangibility. He used his telescope to study optics and help prove his theory of light and color. But when he decided to send the society a paper describing his experiments on light and the conclusions he had drawn from them, the results almost changed history for the worst.

Through a brilliant series of experiments, Newton demonstrated that prisms separate rather than modify white light. In a word, he was a Unitarian. InEnglish astronomer Edmund Halley paid a visit to the secluded Newton.

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Biography for Kids: Scientist