I don't know what you mean with "eroded"; we are not talking about a road made of earth; the analogy doesn't quite apply. However, there are irreversible processes (increase of entropy) in the Milky Way, just as in any other system.
Nobody has ever visited the Milky Way. Earth is in the Milky Way. Every human who has ever lived has spent their entire life in it.
Nobody has been outside the Milky Way.
We are already in the Milky Way. No satellite has ever left it.
The solar system is in the milky way
Most planets that have been discovered are in the Milky Way
As far as we humans know the milky way will not come to an end, although the planets in the milky way will the milky way itself will never come to an end
Nothing has ever explode fastr or bigger then tha milky way in all of einshteins space time
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.
Yes, it is not eternal.
because scientists have discovered it in recent years One problem nobody has ever been out of the milky way!
The Milky Way Galaxy probably started to form about 13.2 billion years ago, and has been forming ever since. It will continue to evolve for billions, if not trillions of years from now.
No one named the Milky Way. It has been seen in the skies since people first looked.See related question for why it is called Milky Way