Home > Iowa Academy of Science > Journals & Newsletters > Proceedings of the Iowa Academy of Science > Volume 59 (1952) > Annual Issue
Document Type
Research
Abstract
Meteoritic dust, material of extra-terrestrial origin, has been identified in two principal forms: spherical particles and irregular, angular particles. Proof of the extra-terrestrial origin of the spherical particles is by chemical analysis, from the fact that their formation cannot be attributed to any known natural terrestrial cause2, by the tendency to obtain higher counts of spherical particles after known meteor showers, and by the occurrence of spherical particles at all times of the year in several widespread localities. The diameters of the particles observed range from about 0.005 mm. up to around 0.2 mm.
Publication Date
1952
Journal Title
Proceedings of the Iowa Academy of Science
Volume
59
Issue
1
First Page
302
Last Page
306
Copyright
©1952 Iowa Academy of Science, Inc.
Language
en
File Format
application/pdf
Recommended Citation
Thomsen, Warren J.
(1952)
"The Annual Contribution of Meteoritic Dust to the Mass of the Earth,"
Proceedings of the Iowa Academy of Science, 59(1), 302-306.
Available at:
https://scholarworks.uni.edu/pias/vol59/iss1/36