One. The Milky Way is our galaxy. Every star you see in the sky at night with your naked eye is in the Milky Way. The closest galaxy to ours is the Andromeda Galaxy, which you can see if you look in the right place, but it will just look like a fuzzy blob and not like a star. The milky way is the name of our galaxy, there are no other galaxies in it.
There are billions of planets and moons in the Star Wars galaxy.
nine
The planets are part of the galaxy.
It is not generally known how many planets are in each galaxy; it isn't even known how many planets are in our own galaxy, and will probably never be known exactly, due to its enormous size. However, according to latest observations, it seems likely that every star has several planets, at least on average.
It is not known. Scientists are still not sure how many dwarf planets are in the solar system or how many true planets are in the galaxy. If estimates from our solar system apply elsewhere, however, the number is probably in the trillions.
Planets orbit stars, stars orbit a galaxy. Planets are not "on" anything. A lot of stars out there have planets - we are just finding out how many now that we have better techniques to find them. So probably all galaxies have at least some stars with planets.
It is extremely likely, but we cannot yet find planets from that far away. All the planets we have found to date are in our own galaxy. The Andromeda galaxy is 2.5 million light years away whereas our galaxy is about 100,000 light years across.
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.
100 Billion
It is possible that every galaxy has some planets. We just are starting to detect some planets in other galaxies.
Probably, but impossible to tell as we are only just seeing planets within our own galaxy.
The planets we know of, some 300 now, are all in the Milky Way galaxy.