There are trillion trillion planets in our galaxy
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.
Astronomer's have not been able to count all the planets in the Andromeda Galaxy. The Andromeda Galaxy is home to one-trillion stars. The Andromeda Galaxy is expected to collide with the Milky Way in the next 4.5-billion years.
We expect the Andromeda galaxy to be just like our own Milky Way galaxy. We can see stars (suns) in the Andromeda Galaxy and just as stars have planets orbiting them in our galaxy, we believe that there must be planets also orbiting stars in the Andromeda galaxy.
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.
There are billions of planets and moons in the Star Wars galaxy.
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.
There are trillion trillion planets in our galaxy
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 possible that every galaxy has some planets. We just are starting to detect some planets in other galaxies.
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
Astronomer's have not been able to count all the planets in the Andromeda Galaxy. The Andromeda Galaxy is home to one-trillion stars. The Andromeda Galaxy is expected to collide with the Milky Way in the next 4.5-billion years.
The planets we know of, some 300 now, are all in the Milky Way galaxy.
Planets are not necessarily in a galaxy but chances are very slim that in a galaxy that is not just newly forming there would not be any exoplanets.