It was
originally proposed in 1905 by Albert Einstein in the paper "On the Electrodynamics of Moving Bodies".[1] The inconsistency of Newtonian mechanics with Maxwell's equations of electromagnetism and the lack of
experimental confirmation for a hypothesized luminiferous aether led to the
development of special relativity, which corrects mechanics to handle
situations involving motions at a significant fraction of the speed of light
(known as relativistic velocities). As of today, special relativity is the most
accurate model of motion at any speed when gravitational effects are
negligible. Even so, the Newtonian mechanics model is still useful (due to its
simplicity and high accuracy) as an approximation at small velocities relative
to the speed of light.

Here in the video below Professor Brian Greene explains the difference between Special Relativity and General Relativity.

Some
predictions of general relativity differ significantly from those of classical physics, especially concerning the passage of time, the geometry of space, the
motion of bodies in free fall, and the propagation of light. Examples of such
differences include gravitational time dilation, gravitational lensing, the
gravitational redshift of light, and the gravitational time delay. The
predictions of general relativity have been confirmed in all observations and
experiments to date. Although general relativity is not the only relativistic theory of gravity, it is the simplest theory that is consistent with
experimental data. However, unanswered questions remain, the most fundamental
being how general relativity can be reconciled with the laws of quantum physics
to produce a complete and self-consistent theory of quantum gravity.

Here in the video below Professor Brian Greene explains the difference between Special Relativity and General Relativity.

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