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" ... But gravitational collapse is a real thing, and given enough time, it will change the Universe. Even though it happens slowly at first, it's relentless and it builds upon itself. The denser a region of space gets, the better it becomes at attracting more and more matter to it. The regions that begin with the greatest overdensities grow the fastest, with simulations indicating that the very first stars of all should form somewhere around 50-100 million years after the Big Bang. These stars should be made of hydrogen and helium exclusively, and ought to be capable of growing to very large masses: hundreds or perhaps even a thousand times the mass of our Sun. And when a star this massive forms, it's a matter of only perhaps one or two million years before those stars die. ... "
" ... But remember, also, that the original overdensities that lead to both star clusters and galaxies are only one-part-in-about-30,000, meaning that these overdensities need to grow over large amounts of time. If it takes gravity tens or hundreds of times as long to reach between star clusters than it does for an individual cluster, you might worry that it takes tens or hundreds of times as much time to make galaxies than stars. ... "
" ... If inflation is also a quantum field — which it ought to be, considering that everything in the Universe is (probably) fundamentally quantum in nature — that means it experiences quantum fluctuations. Energy fluctuations create overdensities that grow into galaxies, and also underdensities that grow into cosmic voids. We can picture inflation as being a ball atop a very flat hill, but as ending when it rolls into a valley below. If there are quantum fluctuations, however, that means there are some “pockets” of the inflationary Universe where inflation ends earlier, others where it ends later, and still others where it must still be ongoing, even today. ... "
" ... The flows of nearby galaxies and galaxy clusters (as shown by the 'lines' of flows) are mapped out... [+] with the mass field nearby. The greatest overdensities (in red) and underdensities (in black) came about from very small gravitational differences in the early Universe. ... "