ASTOUNDING STORIES 20¢ On Sale the First Thursday of Each Month W. M. CLAYTON, Publisher               HARRY BATES, Editor               DR. DOUGLAS M. DOLD, Consulting Editor The Clayton Standard on a Magazine Guarantees That the stories therein are clean, interesting, vivid, by leading writers of the day and purchased under conditions approved by the Authors' League of America; That such magazines are manufactured in Union shops by American workmen; That each newsdealer and agent is insured a fair profit; That an intelligent censorship guards their advertising pages. The other Clayton magazines are: ACE-HIGH MAGAZINE, RANCH ROMANCES, COWBOY STORIES, CLUES, FIVE-NOVELS MONTHLY, ALL STAR DETECTIVE STORIES, RANGELAND LOVE STORY MAGAZINE, WESTERN ADVENTURES, and WESTERN LOVE STORIES. More than Two Million Copies Required to Supply the Monthly Demand for Clayton Magazines. VOL. VI, No. 2                      CONTENTS                       May, 1931   COVER DESIGN H. W. WESSO     Painted in Water-Colors from a Scene in "Dark Moon."     DARK MOON CHARLES W. DIFFIN   148 Mysterious, Dark, Out of the Unknown Deep Comes a New Satellite to Lure Three Courageous Earthlings on to Strange Adventure. (A Complete Novelette.)     WHEN CAVERNS YAWNED CAPTAIN S. P. MEEK   198 Only Dr. Bird's Super-Scientific Sleuthing Stands in the Way of Ivan Sarnoff's Latest Attempt at Wholesale Destruction.     THE EXILE OF TIME RAY CUMMINGS   216 Young Lovers of Three Eras Are Swept down the Torrent of the Sinister Cripple Tugh's Frightful Vengeance. (Part Two of a Four-Part Novel.)     WHEN THE MOON TURNED GREEN HAL K. WELLS   241 Outside His Laboratory Bruce Dixon Finds a World of Living Dead Men—and Above, in the Sky, Shines a Weird Green Moon.     THE DEATH-CLOUD NAT SCHACHNER AND ARTHUR L. ZAGAT   256 The Epic Exploit of One Who Worked in the Dark and Alone, Behind the Enemy Lines, in the Great Last War.     THE READERS' CORNER ALL OF US   276   Series 17 2023 Sponsored by: Copper Cow Coffee Vietnamese Pour Over Coffee Donner Musical Instuments Student Instruments  Glarry Guitars Inexpensive Guitars  Golden Goat CBD CBD & Delta 8 Edibles    Share a Sale Get your podcast or website Sponsored Taza Stone Ground Chocolate Podbean Amazon Apple Stitcher Facebook Our Patreon