Publikationsdatum:
2022-10-13
Beschreibung:
In order to gain further insights into early solar system aggregation processes, we carried out an experiment on board the International Space Station, which allowed us to study the behavior of dust particles exposed to electric arc discharges under long‐term microgravity. The experiment led to the formation of robust, elongated, fluffy aggregates, which were studied by scanning electron microscopy, electron backscatter diffraction, and synchrotron micro‐computed tomography. The morphologies of these aggregates strongly resemble the typical shapes of fractal fluffy‐type calcium‐aluminum‐rich inclusions (CAIs). We conclude that a small amount of melting could have supplied the required stability for such fractal structures to have survived transportation and aggregation to and compaction within planetesimals. Other aggregates produced in our experiment have a massy morphology and contain relict grains, likely resulting from the collision of grains with different degrees of melting, also observed in some natural CAIs. Some particles are surrounded by igneous rims, which remind in thickness and crystal orientation of Wark–Lovering rims; another aggregate shows similarities to disk‐shaped CAIs. These results imply that a (flash‐)heating event with subsequent aggregation could have been involved in the formation of different morphological CAI characteristics.
Beschreibung:
BIOVIA
Beschreibung:
Nordlicht GmbH
Beschreibung:
Deutsche Forschungsgemeinschaft
http://dx.doi.org/10.13039/501100001659
Beschreibung:
Bundesministerium für Wirtschaft und Energie
http://dx.doi.org/10.13039/501100006360
Beschreibung:
NanoRacks LLC
Beschreibung:
Dr. Rolf M. Schwiete Stiftung
http://dx.doi.org/10.13039/501100020027
Beschreibung:
Deutsches Zentrum für Luft‐ und Raumfahrt
http://dx.doi.org/10.13039/501100002946
Beschreibung:
DreamUp
Beschreibung:
Carl Zeiss Meditec AG
http://dx.doi.org/10.13039/501100002806
Schlagwort(e):
ddc:550.78
Sprache:
Englisch
Materialart:
doc-type:article
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