The speed of light in a vacuum is presently defined to be exactly 299,792,458 m/s.This definition of the speed of light means that the metre is now defined in terms of the speed of light. Light always travels at a constant speed, even between particles of a substance through which it is shining. Photons excite the adjoining particles that in turn transfer the energy to the neighbor.
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when we see things we are not directly connected to it. We are, in fact, seeing light -- light that somehow left objects far or near and reached our eyes. Light is all our eyes can really see.
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