Dear Antares 531:

On Feb 14, 3:48*pm, Antares 531 wrote:
What's the most widely accepted position on this. Was the Big Bang a
humongous explosion, or was it a matter of three spatial dimensions
uncurling? If this was an explosion, what did things expand into? Were
the three spatial dimensions we now perceive always there, but
completely devoid of any matter other than the point at which the Big
Bang occurred?

"OG" has the right of it.
http://www.astro.ucla.edu/~wright/cosmolog.htm

David A. Smith