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"Light can travel at the speed of light because it has no rest mass. It can only travel at the speed of light. If it traveled at a speed lower than light, then it would have zero energy, and would cease to exist."
i have a question about this....does light travel at C (the speed of light) through any medium? If i shine a light through water, does the light travel through the water just as fast as through the air even though the water is more dense. i know that sometimes light exhibits wave property and sometimes particle property and sometimes both. I am curious about this though.
Does light only travel at the speed of light through a vaccuum?
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