Star Journal
Concept · Stellaris 4.5.2
Star Journal in the Stellaris encyclopedia: Tracks Unique Encounters throughout the galaxy.
Star Journal in the game's words
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Tracks Unique Encounters throughout the galaxy.
Tracked encounters improve the effects of Celebration.
Source: common/game_concepts (concept_journey_tracker) and localisation/english, Stellaris Cygnus v4.5.2 (9776).