I visualize a list of unanswered questions, perhaps in fill in the blank form, helping pace the game (or just serving as a repository of revelations).

Maybe characters have to fill in one via research/ wild conspiratorial guesswork during the fortian phase to unlock the contact phase; generate two answers to reach the solar system phase, etc. Or maybe each phase generates questions/ blanks that will be answered in subsequent stages? Whichever way, I’m currently assuming that players will answer the questions through play, in part by playing alien characters, rather than the game having a list of canon answers. Maybe one stage in gmed, one gmless, in one the answers are generated by an ‘auto-gm,’ exquisite corpse style (bit like drawn words in sign in stranger… ) Still need to work more on structure of play…

Some blanks to fill in >>
the ________ control the vast wheels that visit the earth. They are here to _______.
(same for torpedoes and clusters of lights)
The _________ live on _________ and view humans as ________.
repeat as needed
___________ have meddled in human history by/to _____________.
Repeat as needed.
the ____________ that fell from the sky in __________ is actually _________.
Repeat as needed
the _________ on/in __________ was constructed/established by ________ to ___________.
The ___________ and the ___________ are fighting an interplanetary war over ___________. Due to _____________, the ___________ are winning.
_____________ passes close to the earth every ____ years. _________ has fallen onto earth and _________ has fallen from earth.
The _____________ believe that _______________ lies on the other side of the stellar pores. 
Repeat as needed. 
Suspended in the high sargossa sea above ____________ is ________ from the surface and ________ from space.