Answer:
In a galaxy.
Step-by-step explanation:
A star is a giant astronomical or celestial object that is comprised of a luminous sphere of plasma, binded together by its own gravitational force.
It is typically made up of two (2) main hot gas, Hydrogen (H) and Helium (He).
Some of the examples of stars are; Canopus, Sun (closest to the Earth), Betelgeus, Antares, Vega etc.
Stars are objects in space that produce their own heat and light.
A galaxy can be defined as a collection or group of many billions of stars, which are existing independently.
Hence, the greatest number of stars would be found in a galaxy.