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27. A. Iida, T. Nakamoto, H. Susa, Icarus 153, 430 (2001). 28. F. H. Shu, H. Shang, A. E. Glassgold, T. Lee, Science 277, 1475 (1997). 29. F. J. Ciesla, Science 318, 613 (2007). 30. D. E. Brownlee et al., 39th Lunar Planet. Sci. Conf. abstract 1978; www.lpi.usra.edu/meetings/lpsc2008/pdf/ 1978.pdf (2008). 31. K. D. McKeegan et al., 39th Lunar Planet. Sci. Conf. abstract 2020; www.lpi.usra.edu/meetings/lpsc2008/pdf/ 2020.pdf (2008). 32. We thank K. Nakamura-Messenger, T. Iwazumi, Y. Wakabayashi, A. Koyama, T. Mori, Y. Suzuki, A. Takeuchi, Y. Terada, H. Nagahara, and H. Yoshida for technical support; M. Sekiya, H. Miura, and M. Uesugi for discussion; and KEK and SPring-8 for experiments. This work was supported by the Japan Society for the Promotion of Science, the NASA Stardust Sample Analysis, and Cosmochemistry Programs. The Wisconsin Secondary Ion Mass Spectrometer Laboratory is partly supported by NSF. Supporting Online Material www.sciencemag.org/cgi/content/full/321/5896/1664/DC1 Materials and Methods SOM Text Figs. S1 to S6 Tables S1 and S2 References
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21. Materials and methods are available as supporting material on Science Online. 22. A. Heger, N. Langer, Astron. Astrophys. 334, 210 (1998). 23. A. P. Crotts, S. R. Heathcote, Nature 350, 683 (1991). 24. J. Xu, A. Crotts, W. Kunkel, Astrophys. J. 451, 806 (1995). 25. B. Sugerman, A. Crotts, W. Kunkel, S. Heathcote, S. Lawrence, Astrophys. J. 627, 888 (2005). 26. N. Soker, Astrophys. J., in pr...
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