| Architecture Type | Defining Trait | Estimated Galactic Prevalence |
| Ordered | Planetary mass generally increases with distance from star (e.g., Solar System) | ≈ 1.5 % |
| Similar (“Peas-in-a-Pod”) | Planets have comparable masses and sizes | ≈ 80 % |
| Anti-Ordered | Most massive planets closest to star | Not Yet Constrained |
| Mixed | No clear mass–distance pattern | Not Yet Constrained |
Planetary System Architectures
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