According to cosmological theory, galaxies, galaxy clusters and larger structures evolved from small inhomogeneities in the matter density of the early universe, which are revealed by variations in the temperature of the cosmic microwave background (CMB).

• 根据宇宙学的理论，星系、星系团和大尺度结构，都是从早期宇宙中，质量密度的微扰演化而来，这也正是宇宙微波背景（CMB）辐射的温度异向性告诉我们的。