Did the Big Bang happen?

[JairCrawford]

So, what I’m wondering is… Is it possible that there was no Big Bang and that the universe simply always existed?

Then you would need a real good argument as of why the cosmic background is so incredibly uniform. Places, in all directions, currently so far away that they can not possibly have interacted with each other if they were always so far apart, and yet....the temperature is the same down to a few micro-degrees.

Right so my non-science savvy brain would conclude that we have good evidence that the universe was at one point smaller and a lot hotter than it is now. But like I said, do we know with absolute certainty that this was a result of blowing up from a singularity?