In Star Trek V: The Final Frontier,
The Enterprise A discovers that the "danger" surrounding the Great Barrier in the center of the Milky Way galaxy is just an illusion or at least not as deadly as everyone had believed, and that a planet of interesting origin lies within, with a very powerful energy being living upon it.
Did the Federation ever re-visit this location? Or was it cordoned off as off-limits to all ships? Are there any in-universe explanations as to whether Starfleet has ever re-visited this location?