Sir Isaac Newton, FRS (4 January 1643 – 31 March 1727) was an English physicist, mathematician, astronomer, natural philosopher, alchemist, and theologian and one of the most influential men in human history. His 'Philosophiæ Naturalis Principia Mathematica', published in 1687, is considered to be the most influential book in the history of science.

• Saturn's interior consists of a small core of rock and ice, surrounded by a gaseous outer layer.
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• Mars' surface area is only slightly less than the total area of Earth's dry land.
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• Liquid water cannot exist on the surface of Mars as a result of it's low atmospheric pressure.
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