Aggregate dust particles at comet 67P/Churyumov-Gerasimenko
Mark S. Bentley, Roland Schmied, Thurid Mannel, Klaus Torkar, Harald, Jeszenszky, Jens Romstedt, Anny-Chantal Levasseur-Regourd, Iris Weber, Elmar, K. Jessberger, Pascale Ehrenfreund, Christian Koeberl, Ove Havnes

TL;DR
This study presents in situ measurements of comet 67P's dust, revealing hierarchical aggregates of elongated grains that resemble interplanetary dust, providing insights into comet formation and dust layer properties.
Contribution
First in situ analysis showing hierarchical, elongated grain aggregates in comet 67P dust, supporting models of comet formation via hierarchical aggregation.
Findings
Dust particles are hierarchical aggregates of elongated grains.
Morphologies include compact grains and porous aggregates.
Supports interstellar dust as building blocks of comets.
Abstract
Comets are thought to preserve almost pristine dust particles, thus providing a unique sample of the properties of the early solar nebula. The microscopic properties of this dust played a key part in particle aggregation during the formation of the Solar System. Cometary dust was previously considered to comprise irregular, fluffy agglomerates on the basis of interpretations of remote observations in the visible and infrared and the study of chondritic porous interplanetary dust particles that were thought, but not proved, to originate in comets. Although the dust returned by an earlier mission has provided detailed mineralogy of particles from comet 81P/Wild, the fine-grained aggregate component was strongly modified during collection. Here we report in situ measurements of dust particles at comet 67P/Churyumov-Gerasimenko. The particles are aggregates of smaller, elongated grains,…
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