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Stiftung Alfred-Wegener-Institut für Polar- und Meeresforschung Am Handelshafen 12 27568 Bremerhaven, Germany http://www.awi.de
Contact Ms Jacqueline Martin +49 471 48311742
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Stiftung Alfred-Wegener-Institut für Polar- und Meeresforschung

Veröffentlichung nicht vor Donnerstag, den 27. Juli 2006, 20:00 Uhr (MESZ)

Kosmischer Staub in irdischem Eis

(PresseBox) (Bremerhaven, )
Seit 30.000 Jahren prasseln konstant kosmische Staubpartikel auf die Erde nieder. Zu diesem Ergebnis kommen zwei Wissenschaftler vom Lamont-Doherty Earth Observatory der Columbia University in New York (L-DEO) und vom Alfred-Wegener-Institut für Polar- und Meeresforschung (AWI) in Bremerhaven. Dazu untersuchten sie erstmals an einem antarktischen Eiskern den Gehalt des seltenen Helium-Isotops 3He in kosmischem Staub. Sie zeigen, dass dessen 3He-Konzentration um mehr als den Faktor 5000 gegenüber terrestrischem Staub angereichert ist. Messungen des auf der Erde sehr viel häufigeren Helium-Isotops 4He weisen außerdem darauf hin, dass sich die Quellen des terrestrischen Staubs im antarktischen Eis zwischen der letzten Eiszeit und nzdzmbk yryfqrzl Xslhhzfb opequlfk vjvrr nmpvnq.

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The publisher indicated in each case (see company info by clicking on image/title or company info in the right-hand column) is solely responsible for the stories above, the event or job offer shown and for the image and audio material displayed. As a rule, the publisher is also the author of the texts and the attached image, audio and information material. The use of information published here is generally free of charge for personal information and editorial processing. Please clarify any copyright issues with the stated publisher before further use. In case of publication, please send a specimen copy to service@pressebox.de.