Space is big

Space is big.

"You just won't believe how vastly, hugely, mind- bogglingly big it is.
I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space. "

Well you would know how big it was if you were machining the milky way. I'll let you know how I get on.

Bonus points if you know where the quote is from!