* Distance and Visibility: Sagittarius is a large constellation, but many of its stars are very faint and far away. We can only see stars within a certain distance from Earth.
* Star Formation: New stars are constantly being born, while others die out. This changes the number of stars in the constellation over time.
* Defining a "Star": There's no clear-cut definition of what constitutes a star. Do we count brown dwarfs, which are too small to fuse hydrogen like stars? Do we include very faint, distant objects that are hard to detect?
What we *can* say:
* Sagittarius contains many bright stars, including the Sagittarius A* supermassive black hole at the center of our Milky Way galaxy.
* It is home to a large number of star clusters and nebulae where stars are born.
* It's one of the most visually impressive constellations in the night sky.
So, while we can't give you a definite number, Sagittarius is a fascinating and star-rich constellation!