In certain circumstances, accelerating objects generate changes in this curvature which propagate outwards at the speed of light in a wave-like manner. As objects with mass move around in spacetime, the curvature changes to reflect the changed locations of those objects. Generally, the more mass that is contained within a given volume of space, the greater the curvature of spacetime will be at the boundary of its volume. This curvature is caused by the presence of mass. In Einstein's general theory of relativity, gravity is treated as a phenomenon resulting from the curvature of spacetime. Sources that can be studied this way include binary star systems composed of white dwarfs, neutron stars, and black holes events such as supernovae and the formation of the early universe shortly after the Big Bang. In gravitational-wave astronomy, observations of gravitational waves are used to infer data about the sources of gravitational waves. The 2017 Nobel Prize in Physics was subsequently awarded to Rainer Weiss, Kip Thorne and Barry Barish for their role in the direct detection of gravitational waves. The first direct observation of gravitational waves was made in 2015, when a signal generated by the merger of two black holes was received by the LIGO gravitational wave detectors in Livingston, Louisiana, and in Hanford, Washington. received the Nobel Prize in Physics for this discovery. The first indirect evidence for the existence of gravitational waves came in 1974 from the observed orbital decay of the Hulse–Taylor binary pulsar, which matched the decay predicted by general relativity as energy is lost to gravitational radiation. Newton's law of universal gravitation, part of classical mechanics, does not provide for their existence, since that law is predicated on the assumption that physical interactions propagate instantaneously (at infinite speed) – showing one of the ways the methods of Newtonian physics are unable to explain phenomena associated with relativity. Gravitational waves transport energy as gravitational radiation, a form of radiant energy similar to electromagnetic radiation. Later he refused to accept gravitational waves. Gravitational waves were later predicted in 1916 by Albert Einstein on the basis of his general theory of relativity as ripples in spacetime. They were first proposed by Oliver Heaviside in 1893 and then later by Henri Poincaré in 1905 as waves similar to electromagnetic waves but the gravitational equivalent. Gravitational waves are waves of the intensity of gravity that are generated by the accelerated masses of an orbital binary system, and propagate as waves outward from their source at the speed of light. In addition to forming deep gravity wells and coalescing into a single larger black hole, gravitational waves will propagate outwards as the black holes spin past each other. Simulation of the collision of two black holes.
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