What was it like when the cosmic web formed?

Closer back in time to the Big Bang, however, none of those entities were present. There were no stars, no galaxies, and no larger-scale structures at all. Instead, everything was extremely smooth and uniform, with very little clumping or clustering to speak of. At the earliest times of all, the densest regions were only thousandths of a percent denser than average, and the regions of lowest density were only a few thousandths of a percent less dense than the cosmic average. Qualitatively, that allows us to put a relatively simple picture together that puts all of these facts in their proper context. The Universe was born with only very tiny imperfections, but gravitation causes those density imperfections to grow, all while the Universe expands. Depending on how, where, and how quickly gravity wins by overcoming this cosmic expansion, we wind up with these enormous galaxies and galaxy clusters separated by regions containing practically nothing: cosmic voids. <a href="https://medium.com/starts-with-a-bang/what-was-it-like-when-the-cosmic-web-formed-193cf2142f24">Click Here</a>