The Universe resembles a dense forest: up close, individual galaxy-trees are visible, gathered into groves, but from a distance everything merges into a solid green canopy. The boundary beyond which the cosmos becomes homogeneous is called the angular scale of homogeneity: it's the size of a patch of sky from which galaxies are distributed evenly.
Astronomers analyzed data from the DESI project, which used spectroscopy (splitting light) to measure distances to hundreds of thousands of bright red galaxies. Scientists "sliced" space into layers corresponding to epochs 4–7 billion years ago, and looked only at angular coordinates, as if assessing the forest canopy from different hills.
It turned out that at angles greater than 70 degrees (tens of full Moons in a row), clumpiness disappears, and the Universe becomes statistically smooth. This result exactly matches the predictions of the standard cosmological model and earlier observations. Thus, the fundamental principle of homogeneity withstands the test of the latest data.
Cosmic homogeneity is not just a philosophical principle: without it, we couldn't reliably measure distances in the Universe, and the Big Bang theory itself would lose its footing.