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Letter (Astounding, June 1938): The Mass-Increase Effect Multiplies the Rest-Mass of the Thing Considered. THe Mass at Light-Speed Is Multiplied by Infinity—Hence Normally Equals Infinity. But Light Cannot Be at Rest, Hence Has Zero Rest-Mass. Zero Times Infinity Is Indeterminate—May Be Anything.

George R. Hilt

First published June 1938
Type Essay

Date Publication Publisher Type Page
June 1938 Cover Astounding Science-Fiction, June 1938 Street & Smith Publications, Inc. MAGAZINE 152|152.2