Contents

04 May 2007
Vol 316, Issue 5825

About The Cover

Cover image expansion

COVER Artist's conception of Mercury, with a cutaway showing the molten core revealed by high-precision radar data. This finding will help to understand the internal structure, thermal evolution, and magnetic field generation of terrestrial planets. Mercury's surface is from Mariner 10 images. See page 710. Image: Christopher Bickel/Science