The Triangulum Galaxy is a spiral galaxy located 3 million light-years away from Earth. In the Megacrossover Earth universe, it was home to the Jedi and the Sith many thousands of years ago and is now home to the Shi'ar civilization.
The most famous events the Triangulum Galaxy were the reign of Emperor Cosinga Palpatine, in actuality the Sith Lord Darth Sidious, and the resulting civil war. Palpatine's rule saw the transformation of the 25,000-year-old Galactic Republic into an authoritarian empire and the Great Jedi Purge. His reign ended after nineteen years when he was killed by his apprentice Darth Vader.
Around 170,000 years after the Battle of Yavin, most of the humanoid populations of the Galaxy experienced a mysterious plague known as the Blight. A group of Ascended Jedi, including Anakin Skywalker, guided a fleet carrying a few thousand humans to the planet Kobol in the Milky Way Galaxy. They became known to the fleet's descendants as the Lords of Kobol.
The Triangulum Galaxy is surrounded by a manifestation of the Source known to its inhabitants as the Force. It is seen as a mystical field that guided people's destinies and can be manipulated by Force-sensitive individuals. Initially, the Force was unified, but the Archdevils implanted the concept of the dark side into the minds of some Jedi. Due to the power of belief and narrative causality, the dark side became real and corrupted the minds of those who did not follow the Jedi Code.
Beings from outside from the Galaxy are immune to the Force. As far as the Force is concerned, they simply do not exist. When corporeal beings from the Galaxy travel to other galaxies, they gradually lose their Force energy and their descendants have no connection to it.
See also Skywalker family