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Stardust to Planetesimals: A Chondrule Connection?The unique nature of chondrules has been known for nearly two centuries. Modern techniques of analysis have shown that these millimeter sized silicate objects are among the oldest objects in our solar system. Researchers have devised textural and chemical classification systems for chondrules in an effort to determine their origins. It is agreed that most chondrules were molten at some point in their history, and experimental analogs suggest that the majority of chondrules formed from temperatures below 1600 C at cooling rates in the range of hundreds of degrees per hour. Although interstellar grains are present in chondrite matrices, their contribution as precursors to chondrule formation is unknown. Models for chondrule formation focus on the pre-planetary solar nebula conditions, although planetary impact models have had proponents.
Document ID
20010059864
Acquisition Source
Ames Research Center
Document Type
Reprint (Version printed in journal)
Authors
Paque, Julie (Search for Extraterrestrial Intelligence Inst. Mountain View, CA United States)
Bunch, Ted (NASA Ames Research Center Moffett Field, CA United States)
Date Acquired
September 7, 2013
Publication Date
January 1, 1997
Publication Information
Publication: From Stardust to Planetesimals: ASP Conference Series
Volume: 122
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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