Relativity?

General relativity was developed by Einstein in the years 1911 - 1915. General relativity is a geometrical theory which postulates that the presence of matter "curves" spacetime, and this curvature affects the path of free particles (and even the path of light). It uses the mathematics of differential geometry and tensors in order to describe gravitation without the use of the force of gravity. This theory considers all observers to be equivalent, not only those moving with uniform speed...In other words...this is some complicated shlt!|||A man sits with a pretty girl for an hour and it seems shorter than a minute. But tell that same man to sit on a hot stove for a minute, it is longer than any hour. That's relativity.





Albert Einstein

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|||It means with respect to something(from one point of view)|||One word is not a ?|||Encyclopedia?|||Relativity is a property of our physical world. Einstein published 2 papers in the early 1900's that stuns the world and change it forever: Special Relativity and General Relativity.





Special Relativity deals with objects traveling at constant velocity, and General Relativity deals with objects traveling under constant acceleration. The essential concepts introduced by Einstein are: (1) speed of light is constant in all reference frames, (2) time is NOT absolute, it depends on the speed of the moving object (3) space and time are intricately connected and is affected by the matter and energy within it, (4) the effects of matterand energy on spacetime is equivalent to gravity (i.e. this is what gravity is).|||Albert Einstein published his theory of relativity in 1920. Here's a quote of his explaining it in terms the average person can understand:





"Put your hand on a hot stove for a minute, and it seems like an hour. Sit with a pretty girl for an hour, and it seems like a minute. THAT'S relativity."|||Relativity principle? A statement that different points of observation are equivalent. Relativity theory derives from that principle.|||The speed of light is a constant (3E8 m/sec) in all frames of reference.|||It's been a century since 25 year old Einstein introduced relativity to to the world. Based on a trully simple fact, that modern experiments results didn't match with physics theories, he reconstructed physics right from the start. Some things taken for granted, such as time and space were redefined and proven to be relative to state of movement. Speed of light, and electomagnetic waves in general, which was thought to be subject to change, now is considered constant. The most famous equasion in the word (E=mc^2) proved scientifically the fact that matter and energy is the same thing in different forms.Einstein's conclusions were radical and magnificent, exceeding the wildest imagination, touching science fiction, or metaphysic and philosophical concepts. At this moment, humanity is trying to surpass the 3 dimensional cage of how our brain is used to work, to come a little closer to the actual truth.