Magnetic Pallasites

摘要

The origin of pallasite meteorites seems to defy explanation because their main constituents-iron and olivine-should have segregated into layers inside their parent body. The generally accepted model suggests that they formed at the core-mantle boundary of an asteroid. Tarduno et al. (p. 939; see the Perspective by Weiss) measured a remnant magnetization in olivine crystals of two pallasite meteorites and conclude that a dynamo must have operated in their parent body, providing further evidence that some asteroids were capable of dynamo generation.