Hypothesis: the true story of the universe begins with a big bang, from there includes a non-stellar source of light and that the CMB was born of that source.

Questions:

What experiment do I conduct to try to disprove any or all of that hypothesis? What apparatus would I build? What would the experiment entail? How would I tell my results have disproved the hypothesis?

What prediction could I make about something people have yet to observe? That is, what could we do to check that hypothesis' predictions? Does it even make predictions that are checkable? If so, what are they, or what is one of them?