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Yay, progress!
But maybe the measurement methods are not correctly understood either, as profen by the brightness of white stars used to determine age, lately.
The ~~cake~~ BigBang is a lie.
original source :
https://iopscience.iop.org/article/10.3847/2041-8213/ad1ddd
see also :
https://en.m.wikipedia.org/wiki/Hubble%27s_law
Hubble tension
In the 21st century, multiple methods have been used to determine the Hubble constant. "Late universe" measurements using calibrated distance ladder techniques have converged on a value of approximately 73 (km/s)/Mpc. Since 2000, "early universe" techniques based on measurements of the cosmic microwave background have become available, and these agree on a value near 67.7 (km/s)/Mpc. (...)
(...) The most exciting possibility is new physics beyond the currently accepted cosmological model of the universe, (...)
Can someone give me the spark notes I started reading but I'll never get through that or probably even understand all of it
As I understand it, there are two measures of cosmic distance/expansion rate in which we are pretty confident.
One is using supernovas as a measure. Since one kind of supernova has very particular characteristics, it is easy to calculate the distance. It is like knowing that everyone has the same kind of candle, if you see a bunch of lights around you, you could make certain assumptions about how far they are from you by how bright they are. Also, with more precise measurements, we can use the doppler effect to know how fast they are moving. We have observed the area around or Galaxy and have come up with a very precise measurement for how fast the universe is expanding.
The other measurement is by looking at the cosmic wave background. This is the "first" thing we are able to see after the big bang. I don't really understand the details of this one, but scientists have also been able to calculate the expansion rate of the universe very accurately with this radiation.
As we have done more experiments to measure these two numbers, instead of converging on the same number, the results are actually diverging. Recent results have even made it so the error bars no longer overlap.
So, we have some big questions -
All of this is called the Hubble Tension. It is probably one of the biggest questions in cosmology currently.
Do all parts of a growing, living creature expand at the same speed?
In America, our guts grow way faster than our brains, bc that's where we do most of our thinking. :-D