Ossus

Ossus was a Jedi library world: temples, reading chambers, and a Great Jedi Library that held centuries of lore. In the Old Sith Wars a supernova — triggered by Sith weaponry in some tellings — scoured the surface and scattered the Order's books to ash and exile.

Jedi still return to its ruins. High Republic and later stories treat Ossus as a place of recovery and teaching; Luke Skywalker's later Order used it in some accounts. Search traffic follows the word 'library' as much as the name.