Title: The Ephemerae
Author: Edmond Hamilton
Year: 1938
Type: short story

“A star burst – and Man’s lifetime was suddenly 70 days instead of 70 years!”–TOC
“The death-drums of a bewildered, frightened race of savages – the Ephemerae – formed the background to the death of a man – and the death of Man’s civilization. Man’s lifetime was seventy days!”

Publications:

• Astounding Science-Fiction, Vol. 22, no. 4, December 1938, (Dec 1938, ed. John W. Campbell, Jr., publ. Street & Smith Publications, Inc., $0.20, 164pp, Pulp, magazine) Cover: Schneeman; Illust: Jack Binder

book review

• Carnell, Ted, “Review of Astounding Science-Fiction for December 1938,” in: NOVAE TERRAE #28 – Vol. 3 No. 4 (Dec 1938) , p. 16. * “The Ephemerae a very poor Hamilton yarn, which never ought to have seen publication in this mag.”

ebook:
https://archive.org/details/Astounding_v22n04_1938-12/page/n49?q=edmond+hamilton++Ephemerae