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how can the speed of light be constant. Einsteins theory of special relativity sets of the speed of light 186000 miles per second 300 million meters per second. Einstein established this within his theory of.
Albert Einstein went through several versions of light speed theory between 1905 and 1915 eventually concluding that light speed is constant when gravity does not have to be considered but that the speed of light cannot be constant in a gravitational field with variable strength. Its just plain weird. Light in a vacuum always appears to move at the same speed the speed of light regardless of the observers velocity.
Light goes through it which makes it not empty.
Central to relativity is the fact that the speed of light in a vacuum is an absolute constant. In special relativity the speed of light is constant when measured in any inertialframe. Albert Einstein went through several versions of light speed theory between 1905 and 1915 eventually concluding that light speed is constant when gravity does not have to be considered but that the speed of light cannot be constant in a gravitational field with variable strength. The answer starts with the invariance of the speed of light.