Title worded awkwardly, but I was thinking about the chemical makeup of our planet, and the other bodies in our solar system. Is the chemical makeup of our star system similar to every other star system? And if not, are we more similar to stars nearest to ours? Is it totally random? Like does every star system have roughly the same amount of iron, hydrogen, oxygen, etc. When averaged out? Has this even been studied?
Homogeneous is more about the pov of the experiment. If you zoom in far enough at sugar water it is not homogenous even if completely dissolved.
So it really depends on how far back you are zooming out to declare something homogenous.