The latter, and also "cold" nucleosynthesis. The redshift/distance relationship can also be explained in a much more visualizable and intuitive way as an inherent redshift of ancient matter's light emissions/absorptions, and that the latter have gradually been getting bluer since then. Also, Fritz Zwicky sought a reasonable explanation back in 1933, with his "tired light" hypothesis. But such ideas haven't been seriously pursued because they lacked a theoretical foundation.Drakkith said:As opposed to a 'cold' big bang? Or no big bang at all?
No, they were abandoned because their predictions don't match observation.hkyriazi said:But such ideas haven't been seriously pursued because they lacked a theoretical foundation.
That's right, as explained in detail here:Vanadium 50 said:No, they were abandoned because their predictions don't match observation.
...is a lot more than what you're describing in your OP. I suggest taking some time to work through a good modern textbook on cosmology, such as Liddle:hkyriazi said:the theoretical basis for a hot Big Bang
The hot Big Bang theory is a scientific model that explains the origin and evolution of the universe. It states that the universe began as a hot, dense, and infinitely small singularity, and has been expanding and cooling down ever since.
There are several pieces of evidence that support the hot Big Bang theory, including the observation of the cosmic microwave background radiation, the abundance of light elements in the universe, and the redshift of distant galaxies. These observations are consistent with the predictions of the theory.
The hot Big Bang theory explains the formation of galaxies and other structures through the process of gravitational collapse. As the universe expanded and cooled, regions of slightly higher density formed due to the clumping of matter. These regions eventually grew into galaxies and galaxy clusters through the force of gravity.
Dark matter and dark energy are both important components of the hot Big Bang theory. Dark matter is believed to make up about 27% of the universe and plays a crucial role in the formation of large-scale structures. Dark energy, on the other hand, is thought to make up about 68% of the universe and is responsible for the accelerating expansion of the universe.
Yes, there are alternative theories to the hot Big Bang, such as the steady-state theory and the inflationary theory. However, the hot Big Bang theory is currently the most widely accepted and supported by evidence. Scientists continue to study and refine the theory to better understand the origins and evolution of the universe.