Image credits
Image Credits:

Photos: solar nebula: J. Bally (U. Colorado); H. Throop (SwRI); C.R. O¹Dell (Vanderbilt U.); NASA; Mercury exterior: NASA/JPL; Venus: NASA/JPL; Moon: Galileo Project, NASA; craters on Venus: NASA/JPL; owl and flower: courtesy of AMNH; coral reef: courtesy of Ian Skipworth, http://www.ianskipworth.com; bacteria: NASA; underwater scene: courtesy of AMNH; Earth's atmosphere: STS-91 Crew, NASA; Mars (all photos): NASA/JPL; Jupiter (all photos): NASA/JPL; Saturn (all photos): NASA/JPL; Uranus sideway tilt: Hubble Space Telescope; Uranus (all other photos): NASA/JPL; Neptune and Triton (all photos): NASA/JPL; Pluto (all photos): NASA/JPL; Illustrations: planets: James Hastings-Trew, http://gw.marketingden.com/planets/planets.html Mercury, Earth, and Jupiter cutaway: Calvin J. Hamilton, http://www.solarviews.com; solar system formation: E. Churchwell (University of Wisconsin); JPL, Caltech, NASA; planets comparison: NASA/JPL Messenger spacecraft: NASA; Magellan spacecraft: NASA/JPL; Jason-1 spacecraft and climate model: NASA/JPL; Odyssey spacecraft: NASA/JPL; Galileo spacecraft: NASA/JPL; Cassini-Huygens spacecraft: NASA/JPL; diagrams of Uranus and Earth tilt: Calvin J. Hamilton, http://www.solarviews.com; Voyager 2 spacecraft: NASA/JPL New Horizons spacecraft: NASA/JPL