|red-shifted light spectra for various celestial bodies|
this is a dead simple one to answer, but in answering it I'll alter your understanding of the universe in FORBIDDEN WAYS.
Ready, part 1?
"HC Unit - Why is Tired Light more fundamentally important than Receding Stars?" that's the title of this blogpost, and the repercussions of the answer are so much more important than ideas posited by the Big Bangists. The light we see from stars in this Big Bang (expanding universe) model was from a star in that position millions of years ago. Since then, it's even further away... and further every day. Our neighbours are falling further and further down the rabbit hole. It's all about the frame of context for the findings - it's near impossible to blindly discern whether you're in a spinning g-machine or whether you're on a high-gravity world. Unless you KNOW.
Ready, part 2?
Consider that red-shifted light only shows us how long that light has been travelling. It has nothing to do with receding stars or Big Bang. For the point of this argument, the stars can be solid loci, fixed in space. More or less. Light, however is anything but fixed and degrades CONSTANTLY towards the microwave frequencies. This could be some inter-stellar process as simple as successive clouds of stardust acting as a dispersal/refractional medium on the light.
Ready, part 3?
The HC Unit model of light suggests rather than a photon beam pouring out, THE ENTIRE UNIVERSE falls into the excess caused at the HC Unit focus. Light is this larger and larger spread of the universe falling in like Tetris blocks to cure the excess. Settle the debt. Solve the stress equation. Effectively, what we see as the 'substance of spacetime through the mirror of this expelled photon' relaxes as it pulls into the star-source from further and further out based on expanding radius of HC Unit FALL IN. So, the stars are there, where they'll have always been throughout history. Mostly. Suddenly, this red-shift-degradation of light via wide-arc Universal Equilibrium gives us an idea of the real distance to the stars.
What we need 'science' to start calculating is the rate of degradation of light... it will be a very long time (potentially) and we don't even know if this rate of Light Tiring is a constant. It might be affected by all sorts of other conditions on its journey from its source to our telescopes and spectral analysers, as suggested above.