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Gravity. (2013 film) Gravity is a 2013 science fiction thriller film directed by Alfonso Cuarón, who also co-wrote, co-edited, and produced the film. It stars Sandra Bullock and George Clooney as American astronauts who attempt to return to Earth after the destruction of their Space Shuttle in orbit.
Gravitational acceleration. In physics, gravitational acceleration is the acceleration of an object in free fall within a vacuum (and thus without experiencing drag ). This is the steady gain in speed caused exclusively by gravitational attraction. All bodies accelerate in vacuum at the same rate, regardless of the masses or compositions of the ...
Artificial gravity is the creation of an inertial force that mimics the effects of a gravitational force, usually by rotation. [ 1] Artificial gravity, or rotational gravity, is thus the appearance of a centrifugal force in a rotating frame of reference (the transmission of centripetal acceleration via normal force in the non-rotating frame of ...
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Gravitation, also known as gravitational attraction, is the mutual attraction between all masses in the universe. Gravity is the gravitational attraction at the surface of a planet or other celestial body; [ 6] gravity may also include, in addition to gravitation, the centrifugal force resulting from the planet's rotation (see § Earth's gravity).
A gravity battery is a type of energy storage device that stores gravitational energy —the potential energy E given to an object with a mass m when it is raised against the force of gravity of Earth ( g, 9.8 m/s²) into a height difference h. In a common application, when renewable energy sources such as wind and solar provide more energy ...
The measurement of the speed of gravity with the gravitational wave event GW170817 ruled out many alternative theories of gravity as explanations for the accelerated expansion. [70] [71] [72] Another observation that sparked recent interest in alternatives to General Relativity is the Pioneer anomaly .
Carlo Rovelli (born 3 May 1956) is an Italian theoretical physicist and writer who has worked in Italy, the United States, France, and Canada. [1] He is currently Emeritus Professor at the Centre de Physique Theorique of Marseille in France, a Distinguished Visiting Research Chair at the Perimeter Institute, [2] core member of the Rotman Institute of Philosophy of Western University in Canada ...
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