What was it like when the cosmic web formed?

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. The cosmic structure that we see today didn’t form all at once, however, with the largest structures forming last. This is the cosmic reason why. <a href="https://medium.com/starts-with-a-bang/what-was-it-like-when-the-cosmic-web-formed-193cf2142f24">Click Here</a>