Does this statement represent a set? Does the following statement represent a set?
"The collection of all the stars in the universe?". I think it represents a set. Please explain if someone agrees or disagrees.
Whether or not it's a set really depends on the context in which you are asking the question.

The answer is "no" if you're doing mathematics, since there's no mathematical definition of a star (in the sky).

But questions like this frequently appear at the beginning of a class where you are first learning informally about sets in mathematics. A set might be described as "a collection of things". The answer would be "yes",  as long as you're willing to agree that everyone knows what a star is (something astronomers might argue about). Then the informal collection of all of them is a set. The sun is a member, so is alpha centauri. The moon is not. Your computer is not.

Of course defining a set as a "collection of things" is OK for  informal understanding but won't do as a mathematical statement unless you had previously defined "collection" ...
To define a set, you just need to define its elements.

here,  elements are stars or suns.

the elements are well-defined, so we can speak about the set $S $ of these elements.

for example, $($vega, the  sun$) \in S^2 $.