What does modern analysis suggest about the material boundaries that formed Earth, as opposed to the classic model?

Answer

The initial reservoir might have been sourced from beyond the expected limits of the initial nebula

Modern research shows fuzzier boundaries than the classic nested ring model suggests, indicating Earth may have incorporated material originating from outside the primary plane or extent of the fully contracted nebula.

What does modern analysis suggest about the material boundaries that formed Earth, as opposed to the classic model?
astronomyEarthsolar systemplanet formationsolar nebula