The proportions of the elements that make up the asteroid...

The proportions of the elements that make up the asteroid 433 Eros are similar to those that make up Earth. Scientists believe that this similarity means that 433 Eros and Earth formed around the same time. If another asteroid formed after Earth formed a solid crust, and if this asteroid was the product of a collision between Earth and an even larger asteroid, how would the new asteroid's composition differ from that of 433 Eros?

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Key Concepts

Planetary Differentiation

Planetary differentiation refers to the process by which a forming planet separates into distinct layers such as the core, mantle, and crust based on differences in density and composition. This concept explains why the composition of a planet can vary from its outer layers to its deeper interior, and it is crucial to understanding how an asteroid formed after a differentiated body like Earth might have a composition dominated by crustal material, rather than a mix that represents the entire undifferentiated state.

Collisional Formation of Asteroids

Collisional formation of asteroids involves the idea that asteroids can form from the debris produced when larger celestial bodies collide. When such impacts occur, especially after a planet has developed a solid crust, the ejected fragments may be enriched in the elements of the outer layers. This fundamental concept helps explain why the new asteroid, formed from a collision involving an already differentiated body, would likely have a marked difference in its elemental composition compared to an asteroid like 433 Eros that shares a more primordial, undifferentiated history.

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