In a previous thread someone pointed me to DH's FAQ article on the Rest Frame of a Photon. In the article DH states, "Time and length cease to have meaning in the limit v→c. In that limit, all time and length intervals shrink to zero," and I've been thinking about the implications of that thought. The ramifications of this statement suggest (to me) that since light travels at c, when it leaves a distant star it is instantly visible to us on our planet (since the distance traveled at c is zero); the term "light year" becomes meaningless (since time at c is zero); and even the idea of "speed of light" has no meaning at all (since speed is a factor of both distance and time -- and both are zero at c). Any thoughts?