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Comment on "Ancient Asteroids Enriched in Refractory Inclusions"

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Science  14 Nov 2008:
Vol. 322, Issue 5904, pp. 1050
DOI: 10.1126/science.1161386

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Sunshine et al. (Reports, 25 April 2008, p. 514) reported that certain asteroids contain 30 ± 10 volume percent calcium- and aluminum-rich inclusions (CAIs). We contend that the amount of CAIs in CV chondrites is two to three times as low as the 10 volume percent assumed by the authors; thus, we question whether the CAI-rich bodies they studied are indeed older than known asteroids or formed before the injection of 26Al into the solar nebula.

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