The Cosmodex 2.0 is a database on BoardGameGeek.com that focuses on "incorporating errata, FAQ rulings, playtester clarifications, crowd-sourced consensus rulings, and other corrections into the text for each card and alien power in the current edition" of Cosmic Encounter.
The Cosmodex 2.0 was created and is maintained by Cosmic expansion co-designer Bill Martinson (BGG user Just a Bill). It includes details on every aspect of Cosmic Encounter and includes clarifications on every card and power in the game. It also includes many solutions for situations that the rules do not address and suggests house rules for aliens or cards to avoid unfair or broken game situations.
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The Cosmodex 2.0 on BoardGameGeek