How does light from the big bang reach us through all the interfering stars dust in tact any matter atall or was the light emitted before the matter had formed

What you are asking about is probably the Cosmic microwave background radiation. The very early universe was opaque so we can only 'see' back so far back into the past.

Cosmic microwave background radiation - Wikipedia, the free encyclopedia (http://www.wikipedia.org/wiki/Cosmic_microwave_background_radiation)