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Science 6 September 2002:
Vol. 297. no. 5587, pp. 1658 - 1659
DOI: 10.1126/science.1075519
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Perspectives

GEOCHEMISTRY:
The Solar System's First Clocks

Jamie Gilmour

Many insights into the formation of our solar system come from isotopic "clocks" in ancient primitive meteorites. But as Gilmour explains in his Perspective, gaining absolute dates for these early events requires painstaking analysis and comparison between different clocks. He highlights the report by Amelin et al., who determine absolute times for two key events in the evolution of solid bodies in our solar system .

The author is in the Department of Earth Sciences, University of Manchester, Manchester M13 9PL, UK. E-mail: jamie.gilmour{at}man.ac.uk

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