Alien: The Fifth Galaxy

leading from

Alien: Galactic Geography

In the Alien script known to feature the Black Ship and the Cylinder, the Nostromo has been directed to a planet that the computer reveals is at the "co-ordinates 1482 to 61325 of fifth galaxy" (1)  Where the fifth galaxy is in relation to Earth is remains unknown but the journey to Earth remains 250 years.

1. Alien script (Black Ship and Cylinder version) page 85, 
2. This 250 year journey time length can be found also in the earlier scripts by Dan O'Bannon
3. In August 1959 edition of the comic book World of Fantasy, issue 19, Vol 1 featured a story called  "Gargoyle From The Fifth Galaxy", with a cover by Jack Kirby.