Relatively

Relativity is a concept in physics that describes how the laws of physics are the same for all non-accelerating observers. It was first proposed by Albert Einstein in 1905 in his Special Theory of Relativity. Later, in 1915, Einstein expanded this to include gravity in his General Theory of Relativity.

Special Theory of Relativity

The Special Theory of Relativity is based on two main principles. The first is the Principle of Relativity, which states that the laws of physics are the same in all inertial frames of reference. The second is the constancy of the speed of light, which states that the speed of light in a vacuum is the same for all observers, regardless of their motion or the motion of the source of light.

This theory has several implications, including time dilation, length contraction, and mass-energy equivalence, famously encapsulated in the equation E=mc^2.

General Theory of Relativity

The General Theory of Relativity is a theory of gravitation that was developed by Einstein between 1907 and 1915. It is an extension of the Special Theory of Relativity, incorporating gravity as a geometric property of space and time, or spacetime.

The theory has important implications for cosmology and has been confirmed in many experiments and observations, including the gravitational lensing of light by massive objects and the gravitational waves detected by the LIGO and Virgo observatories.

See also

• Lorentz transformation
• Twin paradox
• Black hole
• Big Bang

References

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