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Science 14 November 2008:
Vol. 322. no. 5904, p. 1050
DOI: 10.1126/science.1161386
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Technical Comments

Comment on "Ancient Asteroids Enriched in Refractory Inclusions"

Dominik C. Hezel* and Sara S. Russell

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.

Impacts and Astromaterials Research Centre (IARC), Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK.

* To whom correspondence should be addressed. E-mail: d.hezel{at}nhm.ac.uk

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Science. ISSN 0036-8075 (print), 1095-9203 (online)