Answer:
The former astronaut gave an inspiring, opening address to the crowd of excited, fascinated, students.
Step-by-step explanation:
A comma is one of the punctuation marks. The primary function of the comma is to bring a small pause in a sentence. Commas are used to separate different items placed in a series. It is used before coordinating conjunction which joins the two independent clauses. In the above sentences, comma used to separate the adjectives which are placed in a series.