General relativity is a metric theory of gravitation. A gravitational field can be defined using Newton's law of universal gravitation. The Center for Computational Relativity and Gravitation was founded in 2007. The graviton is a hypothetical elementary spin-2 particle proposed to mediate gravitation. This led to the voluminous general relativity textbook "Gravitation" (1973), co-written with Misner and Thorne. Bernoulli also promoted Descartes' vortex theory over Newton's theory of gravitation. In 1687 Isaac Newton explained the cause of elliptic motion in his theory of gravitation. Laplace thus envisaged a combination of gravitation and mechanics as a theory of everything. Isaac Newton used this measurement for establishing his law of universal gravitation. Instead Neptune was predicted using Newton's law of universal gravitation. Louis Witten internationally recognized authority on gravitation physics. Later, Isaac Newton explained this as a corollary of his law of universal gravitation. This agrees with what happens in Newtonian gravitation. Likewise for Newton's law of universal gravitation. These works also provided one of the foundations for Newton's theory of universal gravitation.