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Space Forum / Space Science / September 2005Carbonate found on Comet Tempel 1 by Deep Impact mission?
Deep Impact Spectra: Carbonate, PAHs and Some Amino Precursors in Comet Tempel I. © 2005 by Linda Moulton Howe http://www.earthfiles.com/news/news.cfm?ID=960&category=Science This is important because carbonate requires liquid water to form. This is on a controversial web site, but the detection of carbonate is confirmed by the Deep Impact scientist here: Workshop on Dust in Planetary Systems 2005 Deep Impact and Comet 9P/Tempel 1 : From Evolved Surface to Interior Primeval Dust. C. M. Lisse Johns Hopkins University Applied Physics Lab, Laurel MD 20723 (carey.*****@******.edu) http://www.lpi.usra.edu/meetings/dust2005/pdf/4105.pdf Bob Clark Dear Robert Clark: >Deep Impact Spectra: Carbonate, PAHs and Some Amino Precursors >in Comet [quoted text clipped - 7 lines] > carbonate is > confirmed by the Deep Impact scientist here: Triple point. Ice, water, and steam can coexist. The brief presence of liquid water in an object that (normally and largely) sublimes from solid to gas is not out of the question. David A. Smith Wow. A million-ton fizzy. NASA's Spitzer and Deep Impact Build Recipe for Comet Soup http://www.jpl.nasa.gov/news/news.cfm?release=2005-144 Composition of a Comet Poses a Puzzle for Scientists By KENNETH CHANG Published: September 7, 2005 "In the burst of light after the collision, Spitzer detected specific colors of infrared light that indicated that Tempel 1 contained clays and carbonates, the minerals of limestone and seashells. "Clays and carbonates both require liquid water to form. "How do clays and carbonates form in frozen comets where there isn't liquid water?" said Carey M. Lisse, a research scientist at the Applied Physics Laboratory at Johns Hopkins University who is presenting the Spitzer data today at a meeting of the Division for Planetary Sciences in Cambridge, England. "Nobody expected this." http://www.nytimes.com/2005/09/07/science/07comet.html?oref=login [may require free registration] I'm surprised Lisse would say nobody expected the aqueous minerals to be seen. It is a well-known theory among comet researchers that radioactive heating may have allowed liquid water to form in comets early on in the Solar Systems history. This theory was probably only controversial because it raises the possibility of life in comets, especially given the large abundance of organics, also confirmed by Deep Impact, in comets. Bob Clark > Deep Impact Spectra: Carbonate, PAHs and Some Amino Precursors in Comet > Tempel I. [quoted text clipped - 15 lines] > > Bob Clark > NASA's Spitzer and Deep Impact Build Recipe for Comet Soup > http://www.jpl.nasa.gov/news/news.cfm?release=2005-144 [quoted text clipped - 23 lines] > > Bob Clark On the space oriented bbs uplink.space.com someone mentioned the detections of olivine in Tempel I and previously in other comets raise the possibility of more heating in comets than would be expected for objects formed far from the Sun. This would also be consistent with the theory of radiogenic heating in comets: NASA Research Finds Green Sand Crystals Are in Comet Tempel 1. Date Released: Thursday, September 15, 2005 http://spaceflightnow.com/news/n0007/20cometdust/ Time travel through a trail of comet dust. NASA/GSFC NEWS RELEASE Posted: July 20, 2000. "We know that these dust grains change from amorphous to crystalline as they are heated, and our laboratory research revealed that the rate at which they change is extremely sensitive to temperature," Nuth added. "At the very low temperatures, where water-ice and the other volatile components of comets are frozen, the time required for amorphous silicate dust grains to change to the crystalline olivine found in comet Halley is many times longer than the age of the Universe." http://spaceflightnow.com/news/n0007/20cometdust/ So there at least three separate and independent indications of internal heating, likely radiogenic, in comets: carbonate/clay detected in Tempel I, olivine in Tempel I and other comets, and crystalline ice detected deep in the Kuiper belt: Chilly Quaoar had a warmer past. Mark Peplow Crystalline ice suggests remote object has radioactive interior. Published online: 8 December 2004. http://www.nature.com/news/2004/041206/pf/041206-7_pf.html Bob Clark |
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