It is not known. The Andromeda Galaxy contains about a trillion stars, many of which certainly have planets, though we don't know how many. Many of the planets likely have moons. All told, there are likely several hundred billion to several trillion moons in the Andromeda Galaxy.
At this time we do not know.
There are about 170 known moons in our solar system and probably hundreds of billions more in other solar systems in our galaxy.
More than likely. In 2.5 billion years it will gain at least another 200 when it collides with our Galaxy.
Moons do not orbit the Milky Way because they Milky Way is a galaxy. But if you are thinking about the amount of moons in the Milky Way total, it is around 1-2million. Probably even more.
There are billions of planets and moons in the Star Wars galaxy.
an infinite number
It is not known. The Andromeda Galaxy contains about a trillion stars, many of which certainly have planets, though we don't know how many. Many of the planets likely have moons. All told, there are likely several hundred billion to several trillion moons in the Andromeda Galaxy.
At this time we do not know.
My galaxy, the Milky Way (which is also your galaxy; I am sure that the person asking this question is not a visitor from another galaxy) has not been examined in enough detail to say even how many planets it contains, much less how many moons orbit those planets. But given that our own solar system has numerous moons, and there are billions of other stars in the galaxy which probably also have planets and moons, at a wild guess I could estimate possibly a hundred billion moons.
Very probable this number is not known.
There are about 100 billion stars in the Milky Way Galaxy. We only know of moons in the solar system - 169 of them.
There are about 170 known moons in our solar system and probably hundreds of billions more in other solar systems in our galaxy.
All of the ones we know about and have named are in our Galaxy.
The Earth's moon (there are many other moons in this galaxy) is described as being in "phases."
There are lots of spiral galaxies, so you shouldn't speak about the spiral galaxy as if there were only one, and while there are lots of moons inside galaxies, you may be thinking of galaxies that have other galaxies which orbit them; our own galaxy, the Milky Way, has the Greater and Lesser Magellanic Clouds as satellite galaxies, which perhaps is what you had in mind. A satellite galaxy is not a moon, however.
Come back in a few billion years and the question might be answerable. Till then, we don't know.