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'''Newton's Universe Theory of Gravitation''' is a [[Scientific Theory|scientific theory]] developed by Sir [[Isaac Newton]] that [[explain]]s that the [[planet]]s are held in [[orbit]] around the [[The Sun]] by [[gravity]].

: Before [[Isaac Newton|Newton]] [[scientist]]s had many different ideas about how [[planet]]s were held in [[orbit]] around [[The Sun]]. Some thought they were held by [[magnetism]] and others thought the [[planet]]s were held in invisible crystal [[sphere]]s around [[The Sun]].: [[Isaac Newton|Newton]] was the first to realise that the [[force]] which pulls [[object]]s to the ground on [[Earth]] might be the same as the [[force]] that keeps [[planet]]s [[orbit]]ing [[The Sun]] and [[The Moon]] [[orbit]]ing the [[Earth]]. ==Key Stage 4=====Meaning==='''Newton's Universe Theory of Gravitation''' is a [[Scientific Theory|scientific theory]] developed by Sir [[Isaac Newton]] that [[explain]]s that the [[planet]]s are held in [[orbit]] around [[The Sun]] by [[gravity]]. ===About Newton's Universal Theory of Gravitation===: Before [[Isaac Newton|Newton]] [[scientist]]s had many different ideas about how [[planet]]s were held in [[orbit]] around [[The Sun]]. Some thought they were held by [[magnetism]] and others thought the [[planet]]s were held in invisible crystal [[sphere]]s around the [[The Sun]].: [[Isaac Newton|Newton]] was the first to realise that the [[force]] which pulls [[object]]s to the ground on [[Earth]] might be the same as the [[force]] that keeps [[planet]]s [[orbit]]ing the [[The Sun]] and [[The Moon]] [[orbit]]ing the [[Earth]]. ==Key Stage 5=====Meaning==='''Newton's Law of Universal Gravitation''' states that the [[force]] between two [[object]]s is [[Directly Proportional|directly proportional]] to the product of their [[mass]]es and [[Inversely Proportional|inversely proportional]] to the square of the [[distance]] between them. ===About Newton's Law of Universal Gravitation===: '''Newton's Law of Universal Gravitation''' can be used to calculate the [[magnitude]] of the [[force]] acting between two [[mass]]es.: '''Newton's Law of Universal Gravitation''' has a similar form to [[Coulomb's Law]] in that both are given with a constant multiplied by a product of some physical property ([[Electrical Charge|charge]] and [[mass]]) and [[Inversely Proportional|inversely proportional]] to the square of the [[distance]] between [[particle]]s. ===Equation===<math>F=-G \dfrac{m_1m_2}{r^2}</math> Where; <math>F</math> = The [[force]] acting between the [[Electrical Charge|charged particles]] <math>G</math> = The [[Gravitational Constant]] (<math>6.67\times10^{-11}</math>) <math>m_1</math> = The [[mass]] of one [[object]]. <math>m_2</math> = The [[mass]] of the second [[object]]. <math>r</math> = The [[distance]] between the [[Centre of Mass|centre of mass]] of each [[object]]. The definition can be derived from the equation by considering; <math>-G</math> is a constant so the left hand side and right hand side are [[proportional]]. <math>m_1m_2</math> is the product of the [[mass]]es. <math>\dfrac{1}{r^2}</math> is the the [[Inversely Proportional|inverse]] of the square of the [[distance]]. Therefore; <math>F\propto\dfrac{m_1m_2}{r^2}</math>