Acceptance of a disc-halo structure for the galaxy, together with cosmic ray evidence, leads to the conclusion that cosmic rays are older than 100 million years, and to the conclusion that the abundance of antimatter in the entire galaxy is less than 3x0.0001. 7 pp. Refs. (Author)
This report is part of the RAND Corporation Paper series. The paper was a product of the RAND Corporation from 1948 to 2003 that captured speeches, memorials, and derivative research, usually prepared on authors' own time and meant to be the scholarly or scientific contribution of individual authors to their professional fields. Papers were less formal than reports and did not require rigorous peer review.
The RAND Corporation is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.