Why Are Most of the Planets Composed of Refractory Materials

question 49

Multiple Choice

Why are most of the planets composed of refractory materials found in the inner solar system?

• A) Refractory material existed only in the inner protoplanetary disk.
• B) Planetary bodies can only be formed from refractory materials.
• C) The temperature of the inner protostellar accretion disk was too high for volatile components to remain solid.
• D) All the bodies composed of refractory materials in the outer disk migrated to the inner disk.

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