Comparison of Comet 81P/WiId 2 Dust with Interplanetary Dust from Comets.

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Bibliographic Details
Title:	Comparison of Comet 81P/WiId 2 Dust with Interplanetary Dust from Comets.
Authors:	Ishii, Hope A., Bradley, John P., Zu Rong Dai, Miaofang Chi, Kearsley, Anton T., Burchell, Mark J., Browning, Nigel D., Molster, Frank
Source:	Science (pre-March 2025). 1/25/2008, Vol. 319 Issue 5862, p447-450. 4p. 5 Diagrams, 1 Chart.
Subjects:	Interplanetary dust, Cosmic dust, Interplanetary medium, Dust, Interstellar medium, Solar system, Comets, Near-Earth objects, Milky Way, Planetary science
Abstract:	The Stardust mission returned the first sample of a known outer solar system body, comet 81P/Wild 2, to Earth. The sample was expected to resemble chondritic porous interplanetary dust particles because many, and possibly all, such particles are derived from comets. Here, we report that the most abundant and most recognizable silicate materials in chondritic porous interplanetary dust particles appear to be absent from the returned sample, indicating that indigenous outer nebula material is probably rare in 81P/Wild 2. Instead, the sample resembles chondritic meteorites from the asteroid belt, composed mostly of inner solar nebula materials. This surprising finding emphasizes the petrogenetic continuum between comets and asteroids and elevates the astrophysical importance of stratospheric chondritic porous interplanetary dust particles as a precious source of the most cosmically primitive astromaterials. [ABSTRACT FROM AUTHOR]
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Database:	Psychology and Behavioral Sciences Collection

Description
Abstract:	The Stardust mission returned the first sample of a known outer solar system body, comet 81P/Wild 2, to Earth. The sample was expected to resemble chondritic porous interplanetary dust particles because many, and possibly all, such particles are derived from comets. Here, we report that the most abundant and most recognizable silicate materials in chondritic porous interplanetary dust particles appear to be absent from the returned sample, indicating that indigenous outer nebula material is probably rare in 81P/Wild 2. Instead, the sample resembles chondritic meteorites from the asteroid belt, composed mostly of inner solar nebula materials. This surprising finding emphasizes the petrogenetic continuum between comets and asteroids and elevates the astrophysical importance of stratospheric chondritic porous interplanetary dust particles as a precious source of the most cosmically primitive astromaterials. [ABSTRACT FROM AUTHOR]
ISSN:	00368075
DOI:	10.1126/science.1150683