It's a hard concept to wrap your head around. Eons of time have passed for us, planets have formed, entire species have evolved, flourished and become extinct, ice ages have happened, wars, humanity has grown up and has reached a point where we're on the cusp of escaping the boundaries of this rock we call home... but for the light, it blinked into existence and out again, in a moment, time and distance completely irrelevant to its existence... it's as if instead of traveling across our space and time, it is merely passing through from some other dimension.