- #1
Phys12
- 351
- 42
- TL;DR Summary
- Definition given in a book I am following says that a universe that is homogenous looks the same from any location on large enough scales. How do we know this is true for our universe?
In the book, it states that a universe is isotropic if it looks the same regardless of which direction you look at large enough scales. This seems fairly easy to prove these days with observations from galaxy surveys and the CMB. However, how can we possibly prove that the university is homogenous (definition: the universe looks the same at large enough distances regardless of your location)?