What was it like when the first “polluted” stars formed?

When you look out at the Universe today, and see the vast, dark, backdrop littered with points of light that correspond to stars and galaxies, it’s difficult to imagine that it used to be almost identical everywhere. The Universe, back at its inception, was almost perfectly uniform on all cosmic scales. It was the same high temperature everywhere, the same large density everywhere, and was made up of the same quanta of matter, antimatter, dark matter, and radiation in all locations. At the earliest times, the only differences that existed were minuscule, at the 0.003% level, seeded by the quantum fluctuations imprinted during inflation. But gravity and time have a way of changing everything. Over time, the excess antimatter annihilates away; first atomic nuclei and then neutral atoms form; over millions of years, gravity pulls matter into overdense regions,  <a href="https://medium.com/starts-with-a-bang/what-was-it-like-when-the-first-polluted-stars-formed-5c85c3e03b0f">Click Here</a>