Whenever people talk about "exploring the entire galaxy" I have to laugh. Let's put it this way:
If you could make enough starships so that one arrives at one new star every 60 seconds that would mean 525,960 stars could be visited per year. Even at that incredible rate to visit all 400 billion stars in the Milky Way would take three quarters of a million years (760,514
) to accomplish.
No one's going to explore everything in our Galaxy any time...ever.