Final answer:
Edwin Hubble's observations using the 100-inch telescope on Mount Wilson provide evidence for the universe's isotropy, indicating that it appears the same in every direction and uniformly on a large scale. This isotropy supports the cosmological principle and has significant implications for the understanding of the universe and cosmology.
Step-by-step explanation:
The evidence for the isotropic nature of the universe comes from the observational work of Edwin Hubble, using the 100-inch telescope on Mount Wilson. Hubble's findings show that the universe appears consistent and uniform in every direction. This implies that it looks similar, no matter which section of the universe we observe, and this is termed isotropic. The conclusion that the universe is both isotropic and homogeneous provides significant implication for the cosmological principle, which states that the universe is the same everywhere on a large scale.
Therefore, the observation of a large volume of space at any given redshift or distance resembles any other volume at that same redshift, reinforcing this critical concept. The isotropy of the universe is one piece of edvidence that supports many of the fundamental models of cosmology, including the Big Bang theory and the understanding of the universe's expansion.