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Cosmic ray tracks
Contributing Institution
California Institute of Technology
Image Archive
Rights Information
Materials from the Caltech Archives are made available online for research purposes. Permission for reproduction, distribution, public display, performance, or publication must be obtained in writing from the Head of Archives. The Caltech Archives makes no representation that it is the copyright owner in all of its holdings. It is the responsibility of the user to obtain all necessary rights and clearances for use of materials. For questions, contact Head of Archives.
This cloud chamber photograph (the right half is a mirror image) shows the tracks of a shower of electrons produced by a cosmic ray. Robert A. Millikan gave the name "cosmic rays" to the charged particles (electrons and atomic nuclei) that bombard the earth from all directions in space, and he devoted much of his later research to characterizing this radiation. From this pioneering work, continued by his students, cosmic rays became the key to the discovery of many of the fundamental particles of matter.
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