What single observation historically limited the scope of early protoplanet theory?

Answer

The structure and composition of our Solar System's neighbors.

The foundational framework for the protoplanet theory, or core accretion model, suffered initially from severe System Bias because it was exclusively developed using a single data point. All theoretical constructs regarding what constituted a 'normal' or 'possible' planetary system were derived solely from observing the organization, architecture, and composition of the planets orbiting our own Sun. This constraint meant that characteristics common within our Solar System, such as the clear demarcation between inner rocky worlds and outer giant worlds, were potentially overemphasized as universal laws, making it difficult for the initial models to adequately accommodate the vast diversity in planetary system architectures later revealed by exoplanet surveys.

What single observation historically limited the scope of early protoplanet theory?

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