https://www.slashfilm.com/1678736/dc-comics-star-wars-crossover-didnt-happen-reason/
Even if they could be in the same universe, their storylines are too far apart. The Superman story first intersects with Earth in the 1930s. The first STAR WARS movie, episode 4, was released in 1977 about a story Long, long ago, in a galaxy far, far, away...
https://en.wikipedia.org/wiki/Comparison_of_Star_Trek_and_Star_Wars#Differences
https://screenrant.com/star-trek-star-wars-crossover-echoes-alternate-chekhov/
https://trekmovie.com/2020/09/22/patrick-stewart-wants-to-see-a-star-trek-star-wars-crossover-movie/
https://gizmodo.com/should-star-wars-and-star-trek-ever-have-a-crossover-1341588269
https://stexpanded.fandom.com/wiki/Star_Wars_%26_Star_Trek_TNG:_A_Galaxy_Far,_Far_Away
