There isn't much to "discover" - if you look up at night, you can see it with the naked eye.
Most planets that have been discovered are in the Milky Way
he discovered it on
gallilao
In another Galaxy
a
Gallileo Galilei A+
Gallileo Galilei A+
All of the 1000 or so planets discovered so far, or most of them, are inside the Milky Way.
More than 1,100 open clusters have been discovered within the Milky Way Galaxy and many more are thought to exist.
Yes. There have been hundreds of planets discovered in other stars in the Milky Way. It has been estimated that the Milky Way likely contains hundreds of billions of planets.
70%
Around 1922.