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NATURAL TRANSFER OF VIABLE MICROBES IN SPACE FROM PLANETS IN EXTRA-SOLAR SYSTEMS TO A PLANET IN OUR SOLAR SYSTEM AND VICE VERSA

Valtonen, Mauri und Nurmi, Pasi und Zheng, Jia-Qing und Cucinotta, Francis A. und Wilson, John W. und Horneck, Gerda und Lindegren, Lennart und Melosh, Jay und Rickman, Hans und Mileikowsky, Curt (2009) NATURAL TRANSFER OF VIABLE MICROBES IN SPACE FROM PLANETS IN EXTRA-SOLAR SYSTEMS TO A PLANET IN OUR SOLAR SYSTEM AND VICE VERSA. The Astrophysical Journal, 690, Seiten 510-515. The American Astronomical Society. DOI: 10.1088/0004-637X/690/1/210. ISSN 0004-637X.

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Kurzfassung

We investigate whether it is possible that viable microbes could have been transported to the Earth from planets in extra-solar systems by means of natural vehicles such as ejecta expelled by comets or asteroid impacts on such planets. The probabilities of close encounters with other solar systems are taken into account as well as the limitations of bacterial survival times inside ejecta in space, caused by radiation and DNA decay. The conclusion is that no potentially DNA/RNA life-carrying ejecta from another solar system in the general Galactic star field landed on the Earth before life already existed on the Earth, even if the microbial survival time in space is as long as tens of millions of years. However, if the Sun formed initially as a part of a star cluster, as is commonly assumed, we cannot rule out the possibility of transfer of life from one of the sister systems to us. Likewise, there is a possibility that some extra-solar planets carry life that originated in our solar system. It will be of great interest to identify the members of the Sun’s birth cluster of stars and study them for evidence of planets and life on the planets. The former step may be accomplished by the GAIA mission, the latter step by the SIM and DARWIN missions. Therefore it may not be too long until we have experimental knowledge to answer the question of whether the natural transfer of life from one solar system to another has actually taken place.

Dokumentart:Zeitschriftenbeitrag
Titel:NATURAL TRANSFER OF VIABLE MICROBES IN SPACE FROM PLANETS IN EXTRA-SOLAR SYSTEMS TO A PLANET IN OUR SOLAR SYSTEM AND VICE VERSA
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Valtonen, MauriTuorla Observatory, Turku University, FIN-21500 Piikkiö, Finland
Nurmi, PasiTuorla Observatory, Turku University, FIN-21500 Piikkiö, Finland
Zheng, Jia-QingTuorla Observatory, Turku University, FIN-21500 Piikkiö, Finland
Cucinotta, Francis A.NASA Johnson Space Center, 2101 NASA Road 1, Houston, TX 77058, USA
Wilson, John W.NASA Langley Research Center, Mail Stop 111, Hampton, VA 23681–2199, USA
Horneck, GerdaNICHT SPEZIFIZIERT
Lindegren, LennartLund Observatory, Lund University, Box 43, SE-22100 Lund, Sweden
Melosh, JayDepartment of Planetary Sciences, Lunar and Planetary Laboratory, University of Arizona, 1629 East University Boulevard, Tucson, AZ 85721–0092, USA
Rickman, HansDepartment of Astronomy and Space Physics, Uppsala University, Box 515, SE-75120 Uppsala, Sweden
Mileikowsky, CurtRoyal Institute of Technology (KTH), SE-10044 Stockholm, Sweden
Datum:2009
Erschienen in:The Astrophysical Journal
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:690
DOI :10.1088/0004-637X/690/1/210
Seitenbereich:Seiten 510-515
Verlag:The American Astronomical Society
ISSN:0004-637X
Status:veröffentlicht
Stichwörter:astrobiology, meteors, meteoroids, planetary systems, stellar dynamics
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W FR - Forschung unter Weltraumbedingungen (alt)
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W FR - Forschung unter Weltraumbedingungen
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Strahlenbiologie (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Luft- und Raumfahrtmedizin > Strahlenbiologie
Hinterlegt von: Kerstin Kopp
Hinterlegt am:15 Dez 2008
Letzte Änderung:26 Mär 2013 13:09

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