Enrico Bassissi on SpaceSpace engineerSome time ago
Can you explain how come the speed of light is constant, and what that means on a macro level of the universe?
Asked by Justas Janauskas
Amazing question Justas! I can state two short but quite complete answers: Implying the speed of light to be a constant is the only way in which you can conserve the laws of electrodynamics passing from a inertial system to an another one. The speed of light is constant thus a ray of light emitted from a source (for example, a galaxy) takes a certain amount time to reach an observer at a distance D. Hence the observer is not looking a real time image, but he is experiencing a delay. The lights of stars, galaxy we see on the night sky are delayed proportionally to their distance from the earth. Hope to have granted your curiosity!
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