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Science 4 August 2006:
Vol. 313. no. 5787, p. 588
DOI: 10.1126/science.313.5787.588a
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This Week in Science

Figure 1 The Deep Impact spacecraft's projectile encounter with comet 9P/Tempel 1 excavated pristine material from deep within its nucleus. Lisse et al. (p. 635, published online 13 July) traced its mineral composition of the ejecta in infrared spectra taken with the Spitzer Space Telescope. The mixture of materials seen in the ejecta are usually found in very different environments: highly volatile organic ices; clays and carbonates that form in aqueous environments; and highly crystalline silicates formed at temperatures exceeding 1000 K. These results have implications for the structure and dynamics of the proto-solar nebula 4.5 billion years ago.

CREDIT: NASA/JPL-CALTECH/R.HURT




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