Could the universe have evolved differently? Given the initial conditions at the Big Bang, could our universe have evolved any differently? In other words, did the initial conditions predetermine every stage in the evolution of the universe to this day, or - if we "roll the tape backward" and play it again - could the universe be entirely different on the macro scale (eg. no stars and galaxies)?
Given chaos theory, things could have been different. Given the laws of physics, there are limits to how much difference there could have been.

To put it bluntly, a subatomic particle could have zigged instead of zagging, causing a fusion event that led to the formation of a star not to take place in one spot but another.
But it would not prevent stars from forming.