It's impossible to give an exact number for how many stars are in a galaxy. It depends on the size and type of galaxy.

Here's a general idea:

* Small dwarf galaxies: May have only a few million stars.

* Our Milky Way galaxy: Is estimated to have between 100 and 400 billion stars.

* Large elliptical galaxies: Can have trillions of stars.

So, the number of stars in a galaxy can range from a few million to trillions.