system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] What is the Galactic Wall?

What is beyond it? How did the Yuuzhan Vong breach it? Has there ever been an attempt to explore/colonize beyond it?
gpt
The Yuuzhan Vong breached the Wall via a weakness in the wall in an area known as Vector Prime in the Dalonbian sector. 

AFAIK, the Old Republic launched an expedition to breach the edge of the galaxy, but as it was carrying Jedi a not-yet-Chancellor Senator Palpatine had the expedition obliterated by a young Chiss whom the galaxy would later come to fear: Thrawn.