A wave exists in and is composed by its propagating medium. Einstein erred by replacing the physical;medium for light-wave with 4-D spacetime continuum. Abstract concepts of space and time evolve from our;perceptions of successive?there, here, there? and?then, now, then? arising from the successive motions and;changes in the surroundings. These two abstract concepts cannot fuse into any tangible concrete?spacetime?;continuum. All mufti-dimensional spacetime continua are mathematical constructs bereft of physical existence.;In our Unified Theory, light-medium is the all-composing and all-pervading?sharmon medium? composed by;the new particle?sharmon?.?Origin? of light wave is the first 0-spin sharmon in the sharmon-medium, which;receives energy quantum from the source and rises to its 1-spin state. Similarly,?terminus? of light wave is the;last 1-spin sharmon which transfers energy quantum to the target and itself returns to 0-spin state. From origin;to terminus the 0-spin sharmon composed energy quantum moves as a wave-quantum unity via 1-spin sharmons;which do not physically move. Creative beginning at the origin and vanishing end at the terminus makes;velocity of light-wave invariant to the motions of source and target. Actually observed light velocity is not only;constant and invariant to the velocities of the source and/or the target relative to the sharmon medium;but also locally variable, nay superluminal or subluminal, which invalidate Relativity but are explained;by Unified Theory. The light velocity c becomes c ? v for the observer moving at a velocity ?v relative to the;sharmon medium, ruling out constancy of light velocity c over the inertial frames. Since the velocity of a body;cannot vary (like v) with and be invariant (like c) to, the source-target velocity at the same time, the Lorentz;transforms do not describe any real motion in nature. Thence deduced?contraction of space? and?dilatation of;time? are unrealistic demands on nature to change to fit their mathematics. Bending of light in a gravitational;field follows in Unified Theory with photon having mass without curving the 4-D spacetime.

Keywords: Relativity, Special Relativity, General Relativity, Unified Theory, Aether, Eisntein, Sharmon