Contents

08 July 2011
Vol 333, Issue 6039

About The Cover

Cover image expansion

COVER Composite image of the Sombrero galaxy captured by the Hubble Space Telescope in 2003. Like the Milky Way, the Sombrero is a spiral galaxy with a central stellar bulge and a thin disk containing spiral arms of newly formed stars. The special section beginning on page 169 examines the ways in which galaxies change over time. Image: NASA and The Hubble Heritage Team (Space Telescope Science Institute/Association of Universities for Research in Astronomy