The derelict spacecraft is a crashed ship of unknown origin. It is thought
that a different alien species inhabited this ship before the xenomorphs took over.
They seemed to be humanoid, but standing much taller than normal humans.
When the Aliens took over, It crashed on the planetoid of Acheron or LV-426.
The aliens laid their EGGS in the cargo hold just below the pilot's chamber.
(The pilot was found fossilized with a hole in his / her chest.) This ship gave
of a signal warning people not to enter this spacecraft.