Theories of gravitation
Hammer and feather drop: Apollo 15 astronaut David Scott on the Moon enacting the legend of Galileo's gravity experiment. (1.38 MB, ogg/Theora format).Gravity (also called gravitation) is a natural ...
Theories of gravitation - Wikipedia
Ripples of Gravity, Flashes of Light
More Info: http://www.caltech.edu/news/ligo-and-virgo-make-first-detection-gravitational-waves-produced-colliding-neutron-stars-80082 On Aug. 17, 2017, the Laser Interferometer Gravitational-wave Obs...
Neutron Star Collision Simulation
Courtesy of NASA's Goddard Space Flight Center CI Lab
A New ‘Einstein’ Equation Suggests Wormholes Hold Key To Quantum Gravity
A new Einsteinian equation, ER=EPR, may be the clue physicists need to merge quantum mechanics with general relativity.
Elusive Dark Matter Galaxy Revealed By Cosmic Lens
An invisible dark-matter galaxy hides in the edges of another larger galaxy serving as a natural magnifying glass. Astronomers probing the sky used the gravity of a massive galaxy as a natural magnif...
Earth's Core Is Two-And-A-Half Years Younger Than Its Crust
We have long known that gravity makes the Earth's centre age more slowly than its surface – but the effect is much more pronounced than once thought
LIGO: Journey of a Gravitational Wave
LIGO scientist David Reitze takes us on a 1.3 billion year journey that begins with the violent merger of two black holes in the distant universe. The event produced gravitational waves, tiny ripples...
Gravitational Waves Are Real But What Are They?
Scientists at the advanced Laser Interferometer Gravitational-Wave Observatory facilities found definitive proof of Einstein's prediction about gravitational waves. Brian Greene explains to Stephen Co...
What do Albert Camus and string theory have in common?
Physics is really a branch of existential philosophy, says Brian Greene.
Here's How It Felt to Discover Gravitational Waves
Three LIGO scientists who discovered gravitational waves talk about their amazing discovery and the future of gravitational wave astronomy.
Ripples in the fabric of space have been discovered
Scientists just detected ripples in the fabric of space created by colliding black holes — and science will never be the same.
Gravitational Wave Detection Might Be Announced Feb. 11
Gravitational waves may have been detected for the first time, but we won't know for sure until February 11, 2016 — when scientists will either confirm or dispel the rumors, sources close to the matte...
After 100 Years, Scientists Are Finally Closing In On Einstein’s Ripples
The rain began to fall as Joe Giaime and I scrambled down a lonely rise, back toward the observatory’s main building. It wasn’t so much rain as a hard mist, characteristic of the muggy weather souther...
Spacecraft That Will Test Einstein Theory Ready For Lift-Off
A spacecraft designed to test Albert Einstein's Theory of General Relativity is set to launch on Dec. 2. Under the eLISA Mission, LISA Pathfinder will help scientists detect presence of gravitational ...
Will Quantum Mechanics Swallow Relativity?
At present physicists have two separate rulebooks explaining how nature works. There is general relativity, which beautifully accounts for gravity and all of the things it dominates: orbiting planets,...
History of gravitational theory
In physics, theories of gravitation postulate mechanisms of interaction governing the movements of bodies with mass. There have been numerous theories of gravitation since ancient times.
In the 4...
Newton's law of universal gravitation
Professor Walter Lewin explains Newton's law of gravitation during the 1999 MIT Physics course 8.01 Newton's law of universal gravitation states that any two bodies in the universe attract eac...
Newton's law of universal gravitation - Wikipedia
Introduction to general relativity
General relativity is a theory of gravitation that was developed by Albert Einstein between 1907 and 1915. According to general relativity, the observed gravitational effect between masses results fro...
Introduction to general relativity - Wikipedia
Graviton
In physics, the graviton is a hypothetical elementary particle that mediates the force of gravitation in the framework of quantum field theory. If it exists, the graviton is expected to be massless (b...
Quantum gravity
Quantum gravity (QG) is a field of theoretical physics that seeks to describe the force of gravity according to the principles of quantum mechanics.The current understanding of gravity is based on Alb...
Quantum gravity - Wikipedia
Earth's gravity
The gravity of Earth, which is denoted by g, refers to the acceleration that the Earth imparts to objects on or near its surface. In SI units this acceleration is measured in metres per second squared...
Earth's gravity - Wikipedia
Equations for a falling body
A set of dynamical equations describe the resultant trajectories when objects move owing to a constant gravitational force under normal Earth-bound conditions. For example, Newton's law of universal g...
Equations for a falling body - Wikipedia
Gravitation (astronomy)
Hammer and feather drop: Apollo 15 astronaut David Scott on the Moon enacting the legend of Galileo's gravity experiment. (1.38 MB, ogg/Theora format).Gravity (also called gravitation) is a natural ...
Gravitation (astronomy) - Wikipedia
Gravitational wave
In physics, gravitational waves are ripples in the curvature of spacetime that propagate as a wave, travelling outward from the source. Predicted in 1916 by Albert Einstein to exist on the basis of hi...
Gravitational wave - Wikipedia
Alternatives to general relativity
Alternatives to general relativity are physical theories that attempt to describe the phenomena of gravitation in competition to Einstein's theory of general relativity.There have been many different ...
General relativity
General relativity, also known as the general theory of relativity, is the geometric theory of gravitation published by Albert Einstein in 1915 and the current description of gravitation in modern phy...
General relativity - Wikipedia
String theory
In physics, string theory is a theoretical framework in which the point-like particles of particle physics are replaced by one-dimensional objects called strings. String theory aims to explain all typ...
DGP model
The DGP model is a model of gravity proposed by Gia Dvali, Gregory Gabadadze, and Massimo Porrati in 2000. The model is popular among some model builders, but has resisted being embedded into string ...
Fermi-Walker transport
Fermi–Walker transport is a process in general relativity used to define a coordinate system or reference frame such that all curvature in the frame is due to the presence of mass/energy density and n...