Image credits
Image Credits:

Photos: A Closer Look at Mars: Planets and Sun: Daryl Collins; Robot: Jim Paillot; How Do We Know So Much about Mars: Telescopes: courtesy of David Crisp and the WFPC2 Science Team (JPL/CalTech); NSSDC, and NASA Spacecraft: NASA, Viking Project Robots: IMP Team, JPL (Sojourner (tm); Mars Rover (tm) and spacecraft design and images copyright: 1996-97, California Institute of Technology. All rights reserved. Further reproduction prohibited.) and NASA; Illustrations: A Closer Look at Mars: Jim Paillot; The Search for Martian Life: Maria Zuber: courtesy of Maria Zuber; Star Background: courtesy of AURA; One-on-One with the Sun: Venus, Earth, Mars: courtesy of NASA Sunspot: courtesy of AURA/NOAO/NSF; Crab Nebula: courtesy of Bill Shoening, AURA/NOAO/NSF; Boy: courtesy of Denis Finnin, AMNH