[who_would_fardels_bear]

So the Big Bang theory is not science because we won’t be able to test it?

[Moseley]

So the Big Bang theory is not science because we won’t be able to test it?

That's correct. The Scientific Method -- which pulled humanity out of the Dark Ages and times of superstition -- require:

1) Observe a phenomenon. We observe that the universe is expanding, including with the observation that if we rolled it back in reverse it appears that it would converge (in reverse) at a single point.

2) Formulate a hypothesis to explain the phenomenon. Note that whether the hypothesis is very broad or very narrow or many degrees in between has a gigantic impact on how you think about and understand all of these things. You might have a hypothesis that very powerfully explains a very tiny aspect of astrophysics and celestial mechanics, but have more and more trouble the wider you open your lens.

The big bang theory is a HYPOTHESIS. It is a possible explanation that fits what we observe.

This is what modern science has degenerated into -- confusing a HYPOTHESIS with proof of reality. We have become experts at flights of fantasy. This is one of the stpes of the Scientific Method: FORMULATE A HYPOTHESIS. Great creativity goes into dreaming up a POSSIBLE explanation for what we see.

But unless a hypothesis is tested, it remains a hypothesis. 2)