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===Orbits===
: [[Isaac Newton|Newton]] was the first person to realise that [[object]]s were held in [[orbit]] by [[gravity]] which he [[explain]]ed in his [[Newton's Universal Law of Universal Gravitation|Universal Law of Universal Gravitation]].
: [[Moon]]s [[orbit]] [[planet]]s and [[planet]]s [[orbit]] the [[stars]] due to [[gravity]].
: [[Gravity]] is a constant [[force]] directed to the centre of a [[massive]] [[object]].