Contents

04 January 2008
Vol 319, Issue 5859

About The Cover

Cover image expansion

COVER The universe is filled with filamentary structures of dark and visible matter that make up the "cosmic web," as suggested in this artist's rendering of cosmic bubbles and connected clumps. A special section beginning on page 46 considers the latest research into the origins and evolution of the cosmic web. Image: Shigemi Numazawa/Atlas Photo Bank/Photo Researchers Inc.