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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

© Copyright 1952 by the Iowa Academy of Science, Inc.

Language

EN

File Format

application/pdf

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