I disagree, if radiation was occurring before but just not escaping a gravity well, then when space expanded, that radiation should still have been there hanging around, liberated by the expansion and still there for us to detect.

It seems to be that radiation did not get trapped but didn't happen at all to even be trapped or not. Like more along the lines of "the way subatomic physics works at very high densities just doesn't make sense for radiation to be a thing, but maybe a bunch of other stuff is"

> its the speed of causality.

Also how do you know this is the case anyway, at hyper intense densities that we've never observed and thus don't know the rules of? Or that the speed of light changes that high, or become unlimited, or that things just start to teleport as the main way stuff happens, or whatever

We know it's space itself because everything appears to be moving away from us, personally.

The only two ways that's geometrically possible is if we are actually uniquely special and the center of the entire universe, or if everything is moving away from everything else. The second one is considered the only plausible of the two options.

So what if it had approaching-infinite density? Big Bang does not preclude infinite age. It could have just been increasingly dense going back FOREVER.

The only special thing that happened "at the big bang" that we have direct evidence of is "radiation started occurring". If radiation simply doesn't occur at higher densities than that, then that wouldn't necessarily be the beginning of matter/energy, merely the beginning of radiation

It's good news. They ALREADY had tasers, but we now found out, so we can refuse to sell them batteries or whatever now and do something about it.