Traveller Ancients style stetups could be used.
Both researching leftover Ancient bases and researching whatever cultures have been displaced by the Ancients to other worlds.
You can always research the history of alient worlds, of varying technological levels, with the aliens having varying attitudes towards being scientifically about their history, and taboos of religious or national pride nature. If you assume that it is common that civilisations kill themself off before they develop interstellar travel, you can have many dead ruins as well.
If you had in the past an area with large scale catastrophic events or where you had nearly everywhere failed states like condistions, such as many small warlord kingdoms, that might lead to gaps in historic knowledge.
Some historic knowledge might be lost, because history had been rewritten for political or similiar reasons.
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