Ethan,

You are starting to sound worried.

Face it, Big Bang Theory is a creation myth and it's starting to wear thin.

For one thing, the basic logic is seriously flawed. When cosmic redshift was first discovered, it was assumed to be basic Doppler effect and those sources were simply moving away in space. Then it became apparent this redshift increases proportional to distance in all directions, meaning that either we are at the center of the universe, or the redshift is an optical effect. Since the light didn't seem otherwise interfered with, the only obvious optical effect, the light having to pass through a medium and get "tired," was dismissed.

Then it was argued space itself must be expanding, because "Spacetime!"

Which somehow became dogma and no one questioned it, but it makes no sense.

For one thing, the essential premise of GR and thus spacetime is the speed of light is always measured as a constant in any frame. If the frame, intergalactic space, is expanding, logically the speed of light would have to increase, in order to remain constant.

Instead two metrics of space are being derived from the same light. One based on the speed and one based on the spectrum.

Now in this theory, the speed is still the assumed denominator, the metric against which this expansion is measured.

Consider that with classic Doppler effect, the train moving down the tracks doesn't stretch the tracks, it only increases the distance, so the tracks are the denominator and the distance is the numerator.

This theory still explicitly uses classic Doppler effect to explain the redshift, that the light is taking longer to cross, as the space between galaxies increases.

Which still implies light speed as the real "ruler."

As Einstein said, "Space is what you measure with a ruler." and the ruler in this theory, is still the speed of light.

If you proposed this in grade school math, you would be failed, but somehow it slipped through and everyone has obsessed over the details, without stepping back to look at the bigger picture.

There is one way light redshifts over distance alone and this is as multi spectrum "packets," as the higher frequencies dissipate faster. While single spectrum light will only redshift due to recession.

Yet that would mean we are sampling a wave front, not detecting individual photons that traveled billions of lightyears, which would mean the quantification of light is a function of its absorption and detection, not fundamental to the light itself. Which really messes with dogma.