Carbonaceous chondrites have been heated to high temperature at least once since they formed.

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Carbonaceous chondrites are a class of meteorites that have not been modified due to melting or differentiation of the parent body, and thus have not been heated to high temperatures since they formed. They are known for containing a high proportion of water and organic compounds, indicating they have preserved much of the original material from the solar nebula.

Carbonaceous Chondrites Have Been Heated to High Temperature at Least