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GeoGeoGeoGeo OP t1_jdbufn3 wrote

Reply to comment by jmysl in Findings show substantial amounts of H₂O could only have been delivered to Earth by means of unmelted material, such as chondrites, and not melted material such as achondrites. The results could have important implications for the search for water—and life—on other planets by GeoGeoGeoGeo

Essentially achondrites are melted materials, all produced by melting of their parent bodies such as differentiated planetesimals and differentiated planetary bodies, like the Moon or Mars. Chondrites, on the other hand, have experienced no significant melting as they are pre-planetary rocks, or the building blocks of planets. The implication of this paper then is that Theia (the giant impactor hypothesis that leads to the formation of the moon) could not have delivered water to the early Earth.

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