What might be an equally interesting question is whether some of what we do know is simply wrong.

It's not like it's never happened before.

Consider time; As these mobile organisms, we have this sentient interface between body and context that functions as a sequence of perceptions, in order to navigate, so our experience of time is as the point of the present moving past to future. It is the basis of culture, as narrative and civilization, as history. Physics codifies it as measures of duration.

Yet the evident reality is that change is turning future to past. Tomorrow becomes yesterday, because the earth turns. Duration is the present, as the events form and dissolve.

There is no dimension of time, because the past is consumed by the present, to inform and drive it. Conservation of energy and causality. Cause becomes effect.

Different clocks can run at different rates simply because they are separate actions. Think metabolism.

That culture is about synchronizing the community as a larger social organism, using the same languages, measures, rules, etc, it might seem like there should be one universal frequency, the Newtonian flow of time. Yet there is the entire spectrum of frequencies.

The reason nature is so diverse and yet so integrated, is because everything doesn't march to the beat of the same drummer. Rabbits and turtles.

Ideal gas laws correlate volume with temperature and pressure, but we don't assume them to be extensions of space, even though they are as foundational to our emotions and bodily functions, as sequence is to thought.

Energy is "conserved," because it manifests this presence, creating time, as well as temperature, pressure, color and sound. Rates and degrees, frequencies and amplitudes.

So the energy goes past to future, because the patterns it generates coalesce and dissolve, future to past. Energy drives the wave, the fluctuations rise and fall.

Consciousness also goes past to future, while the perceptions, emotions and thoughts giving it form and structure go future to past.

Though it is the digestive system processing the energy, while the nervous system sorts the information and the circulation system is the feedback loop in-between. The gut decides, the head advises.

Even galaxies are energy radiating out, as structure coalesces in.

As for Big Bang Theory, it was originally assumed to be basic doppler effect, with those distant galaxies moving away in space. Yet when it became evident that cosmic redshift increases with distance in all directions, it either meant we are at the center of the universe, or redshift had to be some sort of optical effect. Since the only known cause would have been some interfering medium, thus "tired light," but there wasn't any obvious distortion, the idea became that space itself must be expanding, because "spacetime!"

Which then became a given, even though it is logically flawed.

For one thing, the basis of General Relativity and thus spacetime is the speed of light is measured as a constant in any frame. So if the frame, intergalactic space, is expanding, the speed of light would have to increase, in order to remain constant. Yet the presumption is that two metrics are being derived from the same light. One based on the speed and one based on the spectrum. And the fact remains that this theory still assumes the speed as the denominator.

Consider that in normal doppler shift, the train moving away doesn't stretch the tracks, it only increases the distance along them. So that makes the track the denominator and the distance the numerator.

This theory still assumes a basic doppler effect. That light is being redshifted because these sources are moving away, in terms the speed of light, so the light takes longer to cross. That makes light speed the denominator and the whole theory falls apart.

If you tried this in grade school math, you would be failed, but somehow it popped out of the scrum of early 20th century physics and no one looked back.

One way light does redshift over distance, is as multi spectrum "packets," since the higher frequencies dissipate faster, but that would mean we are sampling a wave front, not observing individual photons having traveled billions of lightyears, which opens another theoretical can of worms.