GMAT Sentence Correction (SC) | Re: Astronomers have theorized that the Big Bang governs the

Hi, there. I'm happy to help with this.

Astronomers have theorized that the Big Bang governs the behavior of interstellar dust, particles that comprise the atoms and molecules created in the progenitive explosion and persisting in even the emptiest regions of space.

First of all, the word"and " does not connect coordinating or subordinate clauses --- those require both a noun and verb. The word"and " connects two participial phrases (= participle form of a verb + object).