Membership
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Fellow: American Geophysical Union; Gesellschaft Deutscher Naturforscher und +arzte
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German Physical Society
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Deutsche Gesellschaft Luft- und Raumfahrt e.V.
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European Geophysical Society
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German Astronomical Society
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Royal Astronomical Society (associate)
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Austrian Academy Scis. (correspondent)
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International Astronomical Union
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Academy Europaea
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Royal Swedish Academy Scis.
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International Academy Astronautics (vice president 1989?Co)
