'Stars' in the Book of Revelation mean
various things.

They may represent human beings, as in
Revelation 1:16,20 where they are guard-
ians, or pastors, of the Seven Churches.
[also see Daniel 12:3]

They can be good angels or bad angels as
in both the Old and New Testaments.
[Judges 5:20 and Revelation 12:4]

They are seen as meteorites as in the
Sixth Seal. [Revelation 6:13]