Thank you Niraj, for the text and links to the Audio for The Last Question..
A remarkable sequence of tales, linked by inquisitiveness and a written a mere 20 odd years after the conception of Dark Matter by Fritz Zwicky
Isaac Asimov casually drops the expansion of our universe into this wonderfully economical tale. By doing so, says more in a sentence or two than most of us can manage in an afternoon!
I have read and enjoyed this several times. It never fails! You may listen to chapter 1 here.