[Old Professer]

Or, is the writer trying to say that the condensed mass was so hot within his "soup" that it could only condense to planets, etc. by expanding?

[VadeRetro]

Or, is the writer trying to say that the condensed mass was so hot within his "soup" that it could only condense to planets, etc. by expanding?

This too is true. The universe cooled as it expanded, which is how it took some hundreds of thousands of years before subatomic particles started condensing into hydrogen, helium, and lithium atoms. The pre-inflation singularity was something called a "quark-gluon plasma."