How Big is Space?

The age old question, one that pops in and out of our thoughts from time to time. This huge expansive topic floats through my mind each time I fly. Especially at twilight, flying into the curvature of darkness, you look up into the deeper blue and imagine all that is beyond our planet. Exciting...
http://www.bbc.com/future/story/20120321-how-big-is-space