Multiverse

The multiverse was an undetermined number of parallel universes and alternate realities that the galaxy far, far away was connected to.

Some beings who became force ghosts upon death were allowed to learn the secrets of these other universes. Apparently, many of them looked just like the "real" galaxy, but had much different histories of what happened in the different eras and conflicts. Sometimes, some spirits wondered if any one of these parallel worlds may have been the "real reality" instead.

Known alternate realities
This is a list of some alternate realities that spirits discovered the existence of, spirits like, , and , and how their histories were different from their familiar history.
 * The ancient Sith Empire triumphed over the Old Republic.
 * The Jedi Order and the Republic didn't become complacent, and so were able to foresee the return of the Sith and prepare for it.
 * The Trade Federation won the Battle of Naboo.
 * Anakin Skywalker convinced his fellow Jedi to stop paying attention to old man-made rules, consider having families, and listen directly to the Force.
 * The Republic and Jedi Order uncovered Darth Sidious' plot to destroy them, defeated him, and reclaimed the galaxy.
 * The Confederacy of Independent Systems won the Clone Wars and became a free intergalactic government. Several alternate realities showed a variety of ways this happened.
 * General Grievous overwhelmed the clone armies with heavily armed strategies.
 * Admiral Trench wiped out the best Republic fleets.
 * Organic militias, like those of Umbara, Jabiim, Dac, Ando, Mandalore and New Plympto, for example, mowed down the professional clone troopers with their passionate fighting spirit.
 * Dooku and Grievous succeeded in taking Coruscant at the end of the war.
 * Dooku betrayed and killed Sidious and used the Confederacy for his own purposes.
 * Republic senator Padme Amidala and Separatist senator Mina Bonteri succeeded in bringing peace between the Republic and the Confederacy.
 * Jedi Barriss Offee embraced the Force-enhancing bota drug on Drongar, becoming the greatest power in the galaxy, cast down Sidious and Dooku, and became a new Dark Lord of the Sith, taking over the galaxy until Anakin and his children stopped her.
 * Many individual clone troopers refused to obey Order 66.
 * The Galactic Empire had a much tougher fight conquering the galaxy, but still almost succeeded, though still defeated by the Rebel Alliance.
 * The Empire wiped out the Rebellion.
 * The Emperor turned Luke Skywalker to the dark side.
 * Darth Vader turned Leia Organa to the dark side.
 * Darth Vader died without redemption.
 * Grand Admiral Thrawn defeated the New Republic and successfully prepared the galaxy for the Yuuzhan Vong.
 * Admiral Daala got sweet revenge on the New Republic with her war machines and her tactics.
 * The Yuuzhan Vong conquered the galaxy.
 * Jacen Solo didn't embrace the Unifying Force during the Yuuzhan Vong War, and never became Darth Caedus.
 * Abeloth destroyed the New Jedi Order and the Galactic Alliance.
 * Darth Krayt ravaged the galaxy to the point of nearly half its inhabitants going extinct.