Why does the initial collapse proceed unimpeded by thermal pressure in the very early stages?

Answer

Generated heat can easily radiate away into space

In the early, diffuse state of the molecular cloud, the material is relatively transparent, allowing the heat generated by the initial crunch to escape easily, thus preventing the internal temperature from rising fast enough to counteract the gravitational pull.

Why does the initial collapse proceed unimpeded by thermal pressure in the very early stages?
protostarstellar evolutionstar formationastrophysicscollapse