1. The system must have 2 Terra planets, or 1 Terra and 1 Desert, in the Habitable Zone with multicellular life. 2. The system must be in the Milky Way or Andromeda Galaxy, or their satellite galaxies. 3. Both world must have at least 1 large moon (like ours), or be a moon of another planet (for tides), and have similar diameters. 4. Atmospheric pressure must be close to Earth's (0.5-2.0 atm). 5. Eccentricity must be <0.2 6. Star can be any type, but preferably G, K or M (they have longer lifespans). 7. Thera seems to receive a lot less light then it's neighbor, so try to find a system where the 2 have a large gap between them, with/without a dwarf planet and/or asteroid belt. 8. The star can be either catalog or procedural.
So far, I've found 1 close match (even the continents are similar), but the inner world has too much pressure, and the suns have too short a lifespan. Also, the life on these 2 is unicellular. Probably hasn't been colonized by multicellular life yet.
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