I’m sorry, that’s not how the Doppler effect works. It doesn’t matter how big or far away the source of light is. The light it gives off will shift to higher or lower frequency depending on its speed relative to the observer. This tells you how fast it is either approaching or receding. You don’t actually have to see it moving. This is how cops can instantly tell exactly how fast your car is going using a radar gun.
i do not believe they are even remotely the same. there is no way that movement can be detected in a span of say ten years that is 1.5 billion light years away. unless they can physically show me 3 individual frames that differ showing the movement. And I doubt then i’d fully buy it! the colors you see are not temperatures or speeds. they are added for visual purposes to show the different galaxies...
I’ve followed these threads for years and mainly because the fake news/photos from APOD CONSTANTLY, i find it hard to believe ANYTHING out of the space agency anymore.
But don’t you need to know what color it was to begin with?
We are talking about a galaxy as it existed over 11 billion years ago, less than 3 billion years after the universe first formed. The composition of that galaxy, including the number of red, yellow and blue stars, would affect the red/blue spectrum at the source, throwing off the baseline assumptions being made to calculate the velocity using the Doppler effect.
It seems like a lot of guesswork to me.