The xenomorphs official discovery date

[Klara Fills]

The official discovery date of the Xenomorphs in the Alien franchise is generally traced back to the events of Ridley Scott's 1979 film, Alien.

[Xenotaris]

The official discovery date of the Xenomorphs in the Alien franchise is generally traced back to the events of Ridley Scott's 1979 film, Alien.

Well I meant the in-universe discovery but thank you for answering. 

[Slutty Badger]

Whatever happens with the upcoming continuity, Covenant will probably remain humankind's first encounter with a big-X Xenomorph of any kind.

[Xenotaris]

Whatever happens with the upcoming continuity, Covenant will probably remain humankind's first encounter with a big-X Xenomorph of any kind.

Alrighty. That works for me.