Earth feels pretty large, and we feel pretty tiny living on it.

But we rarely, if ever, stop to think about the vast beyond. And we should!

Former astronomer Carl Sagan wrote in his book "Pale Blue Dot: A Vision of the Human Future in Space":

There is perhaps no better demonstration of the folly of human conceits than this distant image of our tiny world. To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known.

So just how small is Earth compared with the rest of outer space? These photos will help put our planet in perspective.