Jupiter and its moon Ganymede

Jupiter and its moon Ganymede

Fig. 9.1 . The icy surface of Ganymede, Jupiterís largest moon, is seen just before it passes behind the planet (bottom). The giant Jupiter is portrayed in close to natural color, including its Great Red Spot (center), the biggest and oldest known storm in the solar system. The spotís east-west diameter is more than twice that of Earth, and one-sixth the diameter of Jupiter itself, and the red swirling vortex has been observed for at least 300 years. By watching Jupiter eclipsing its moon Ganymede, astronomers have searched for haze that causes a slight dimming at different colors. This image was taken on 9 April 2007 from the Hubble Space Telescope. (Courtesy NASA/ESA/ E. Karkoschka, U. Arizona.)

Copyright 2010, Professor Kenneth R. Lang, Tufts University