Very loosely, relativity says massive objects change the geometry of space/time. Bending both time and space.
There are two. There is Special relativity, the one that says you can't go faster than the speed of light. Then there is General relativity, the one that describes gravity as bending space rather than as a Newtonian attraction between objects.
Yes. Everything is subject to relativity. We know that electormagnetism (EM) is subject to relativity because we see light from distant stars and galaxies bent by the gravity of intervening objects (see http://en.wikipedia.org/wiki/Gravitational_lens). Gravity is subject to relativity because it is an essential element of General Relativity. GR says that gravity is the curvature of spacetime.
General relativity explains gravity as the result of the curvature of spacetime caused by the presence of mass and energy. Objects with mass create a "dip" in spacetime, causing other objects to move towards them due to the curvature of this space.
General relativity explains gravity as the result of the curvature of spacetime caused by mass and energy. This differs from classical theories of gravity, such as Newton's law of universal gravitation, which describe gravity as a force acting between objects with mass.
General relativity explains gravity as the result of the curvature of spacetime caused by the presence of mass and energy. Objects with mass create a "dent" in spacetime, and other objects are pulled towards this dent, which we perceive as gravity.
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Gravity, to be a field force, would require a particle to transmit it. To date, all attempts to detect gravitons have failed. Either they don't exist, or they are very inconvenient to detect. General Relativity provides us a way of thinking about gravity without needing to assume the existence of elusive gravitons. General Relativity says that mass tells space how to bend, and then space tells mass how to move.
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Einstein revised our idea of planetary orbits in his theory of relativity, which says that planets orbit the sun because of the sun's distortion of space. This distortion causes space to bend. The planets move along this bend. Think of a Bowling ball placed on a mattress. The ball causes a circular dent in the mattress. If you shoot a marble at the ball, the marble will move around the bowling ball in a circle along the path of the indentation. In the same way, the planets revolve along the indentation the sun makes in space.
The theory of relativity, proposed by Albert Einstein in the early 20th century, consists of two main parts: special relativity and general relativity. Special relativity deals with the relationship between space and time, showing that they are intertwined in a four-dimensional spacetime continuum. General relativity extends this to include the effects of gravity, explaining how massive objects curve spacetime and create the force of gravity. This theory has revolutionized our understanding of the universe and has been confirmed through numerous experimental observations.
They don't. The basic physics behind the situation says that all objects fall together, regardless of their mass, weight, race, color, creed, national origin, or political affiliation. In the reral world, especially on Earth, we occasionally see things falling at different rates.
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