Why ask useless questions? How deep is the ocean? How high is the sky? Who is Satoshi Nakamoto?
Radius from earth to the edge of the visible universe: 46.5 billion light years, http://geology.com/records/deepest-part-of-the-ocean.shtml
Satoshi Nakamoto: a human being or beings
I know what you are trying to say, "why ask unanswerable questions", but all questions have answers.
Amir Taaki