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3 × 10^8 m/s whatever might be the speed of object irrespective of the frame. Eg.: You are standing and looking at a ray of light , as you are stationary w.r.t. the surroundings you will find the speed of light is 3 × 10^8 m/s. Now if an alien from its spaceship looks at you.. you are moving as earth is revolving and rotating so you have a speed due to that frame, but still when that alien looks at same light ray the speed is still same. Now alien tries to catch the light ray and boost engine of its spaceship bearing speed of light itself and even then it still see the same light ray is still going with same speed, the person standing on ground looks at this eye catching momentarily moment and he still sees that speed of light is still the constant. So whatever might be the frame of reference speed of light stays the same.