> The cosmological principle is usually stated formally as 'Viewed on a sufficiently large scale, the properties of the universe are the same for all observers.' This amounts to the strongly philosophical statement that the part of the universe which we can see is a fair sample, and that the same physical laws apply throughout. In essence, this in a sense says that the universe is knowable and is playing fair with scientists.
There is no evidence that the nature of the electron or carbon atom is different in different parts of the universe. This would be detectable (if it was) by shifts in the spectral lines for atoms or differences in ratios of elements.
The law of gravity appears to be consistent throughout the observable universe. The physics of atoms and ratios associated with nucleosythesis have been shown to be consistent.
The constants of physics appear to remain constant over billions of years ( https://apod.nasa.gov/apod/ap050220.html - " Oklo by-products are being used today to probe the stability of the fundamental constants over cosmological time-scales" )
How do we know that distant galaxies are composed of matter rather than anti-matter? If equal quantities of each were produced in the big bang, might not some parts of the universe contain primarily matter and other parts primarily anti-matter? - https://www.scientificamerican.com/article/how-do-we-know-th...
> Astronomer William Keel explains:
> The cosmological principle is usually stated formally as 'Viewed on a sufficiently large scale, the properties of the universe are the same for all observers.' This amounts to the strongly philosophical statement that the part of the universe which we can see is a fair sample, and that the same physical laws apply throughout. In essence, this in a sense says that the universe is knowable and is playing fair with scientists.
There is no evidence that the nature of the electron or carbon atom is different in different parts of the universe. This would be detectable (if it was) by shifts in the spectral lines for atoms or differences in ratios of elements.
The law of gravity appears to be consistent throughout the observable universe. The physics of atoms and ratios associated with nucleosythesis have been shown to be consistent.
The constants of physics appear to remain constant over billions of years ( https://apod.nasa.gov/apod/ap050220.html - " Oklo by-products are being used today to probe the stability of the fundamental constants over cosmological time-scales" )
How do we know that distant galaxies are composed of matter rather than anti-matter? If equal quantities of each were produced in the big bang, might not some parts of the universe contain primarily matter and other parts primarily anti-matter? - https://www.scientificamerican.com/article/how-do-we-know-th...