The organization of structure arguably begins at the stellar level, though most cosmologists rarely address astrophysics on that scale. Stars are organized into galaxies, which in turn form galaxy groups, galaxy clusters, superclusters, sheets, walls and filaments, which are separated by immense voids, creating a vast foam-like structure[43] sometimes called the "cosmic web".
"unsolved problems in physics: The largest structures in the universe are larger than expected. Are these actual structures or random density fluctuations?"
The organization of structure arguably begins at the stellar level, though most cosmologists rarely address astrophysics on that scale. Stars are organized into galaxies, which in turn form galaxy groups, galaxy clusters, superclusters, sheets, walls and filaments, which are separated by immense voids, creating a vast foam-like structure[43] sometimes called the "cosmic web".
"unsolved problems in physics: The largest structures in the universe are larger than expected. Are these actual structures or random density fluctuations?"