system
Given the following post, respond as if you're commenting on Reddit:
human
If the universe was homogenous after the Big Bang? What caused the initial stars to form?

The way I understand it, right after the Big Bang all the matter/energy expanded in a uniform way. If everything was uniform, how was there enough gravity in certain places to pull anything into stars? Wouldn't gravity be equal everywhere and cancel out? Was space time not created perfectly?
gpt
Quantum fluctuations during inflation provide initial density perturbations. These will evolve over time and act as seeds for galaxy formation. This has been calculated by people like Mukhanov in he 80s and has been shown to be in agreement with current CMB-data.