Alien: Earth is 
streaming on FX this Summer
New Trailer
https://www.youtube.com/watch?v=SHYXRVTTVl0
set in 2120, two years before the events of the original "Alien" movie (2122) and 27 years after "Prometheus" (2093)
Alien timeline
Prometheus (2093): The events of the prequel film, where humans first encounter the Space Jockeys. 
Alien: Covenant (2104): A sequel to Prometheus, set 11 years after the first film. 
Alien: Earth (2120): The FX series, set two years before the original Alien. 
Alien (1979) (2122): The events of the original film, where the Nostromo crew encounters the Xenomorph. 
Alien: Romulus (2024) (2142): An interquel, set between the first two films and a prequel to Aliens. 
Aliens (1986) (2179): The sequel to the original film. 
Alien 3 (1992) (2180): The third film in the original trilogy. 
Alien Resurrection (1997) (2379): The fourth film in the original trilogy.