CMB

A diagram is shown depicting various parts of the universe that are observable. In the middle are the parts closest to Earth, and around the far edges are parts furthest from Earth. Planets, galaxies, and the CMB are illustrated. Please see the explanation for more detailed information.
图中展示了宇宙中可观测的各个部分。中间部分是距离地球最近的区域，边缘部分是距离地球最远的区域。图中还标出了行星、星系和宇宙微波背景辐射（CMB）。有关更多详细信息，请参阅说明。