"Richard D. Saam" wrote:

The solution is that it is a matter of temperature. That a lumpy
distribution has higher entropy than a smooth distribution as soon as
gravity is involved is only true for low temperatures. For high
temperatures, the smooth distribution still has the higher entropy.
That's why the universe has to be cold enough before galaxies and stars
can form.

In as much as galaxy and star planetary system size distributions
are different, are two different formation temperatures required
within the concept of Jeans' length?

As you can read he

https://en.wikipedia.org/wiki/Jeans_...eans.27_length

Jeans' length depends on T^(1/2) for constant mass density and constant G.
So, for high temperatures, the length is very big, allowing only for big
clouds to collaps, e.g. a proto-galactic cloud to form a galaxy, whereas
for low temperatures, also smaller clouds can collaps, e.g. a proto-stellar
cloud to a star.