<s>[INST] In the early universe, the mass density didn't just vary smoothly. There were discrete concentrations of mass, or gravitational fluctuations, that eventually collapsed to form the objects we see today, such as galaxies and galaxy clusters. These fluctuations are thought to have arisen from random quantum mechanical fluctuations that took place when the universe was still incredibly hot, during its very first fraction of a second.
In other words, the universe began in a very smooth state and evolved into a clumpy universe, with matter clumping together under its own gravity. So, what should we expect for the current universe?[/INST]