A Solar System Photo Gallery
Jupiter and Its Satellites

Jupiter is seen here in a Cassini image taken 29 December 2000 from 10,000,000 km away. Jupiter is the largest planet. The surface visible here is the cloudtops in an atmosphere of (mostly) hydrogen and helium. Most of Jupiter's volume is liquid hydrogen. The clouds are blown into bands around Jupiter, with different colors indicating different compositions of clouds at different altitudes in its atmosphere. The Great Red Spot, just below the center, is a seemingly permanent circular storm 15,000 km long--although its color does vary in intensity. (Credit: NASA, JPL, Space Science Institute)
Metis is shown in a Galileo image taken in November 1997. Metis is 60 km long and orbits within Jupiter's thin ring. (Credit: Cornell University, NASA)
Adrastea is shown in a Galileo image taken in 1996/7. Adrastea orbits just outside Jupiter's ring and is 20 km across. (Credit: Cornell University, NASA)
Amalthea is seen here in a composite of Galileo images from 17 December 1996 and 20 February 1997 (distances in the neighborhood of 500,000 and 800,000 km). Amalthea is 150 km long and is shaped by impacts and tidal effects from Jupiter's gravity. The reddish color likely represents a layer of material ejected from Io into orbit around Jupiter and subsequently collected on Amalthea. (Credit: Cornell University, NASA)
Thebe is seen in this Galileo image taken 4 January 2000 from 193,000 km away. Thebe is 120 km across. (Credit: Cornell University, NASA)
Io is shown here in a mosaic of Galileo images taken 3 July 1999 from 130,000 km away. Io is 3,600 km across and is the most volcanically active body in the solar system. With no significant atmosphere, ejecta from Io's volcanoes forms parabolic plumes rising hundreds of kilometers above its surface. (Credit: Galileo, USGS, JPL, NASA)
Europa is shown in a Galileo image taken 7 September 1996 from 677,000 km away. Europa is 3,130 km in diameter and is mostly rocky. However, the 10-50 km thick layer of ice at the surface may conceal an ocean of liquid water 60-150 km deep. The dark streak are cracks in this outer layer of ice and may be dark from material upwelled from this ocean. (Credit: Galileo, JPL, NASA)
Ganymede is shown in a Galileo image taken 26 June 1996. At 5,300 km in diameter, Ganymede is the largest satellite in the solar system. It is mostly ice with a rocky core. The lighter regions represent tectonic activity in the icy crust and mantle. The dark region at the upper right is Galileo Regio; the light colored ripples in this area are the remains of a large multi-ringed impact. More recent craters are bright spots, showing ice exposed from below the surface layer of dust. (Credit: Galileo, JPL, NASA)
Callisto is shown in this Voyager 1 image taken 6 March 1979 at a distance of 350,000 km. On the right side is the center of the Valhalla multi-ringed impact basin, exposing the ice making up much of Callisto. Callisto is 4,800 km in diameter. (Credit: JPL, NASA)
Himalia is shown in this Cassini image taken 19 December 2000 from 4,400,000 km away. Himalia is 160 km across and is suspected of being a captured asteroid. (Credit: Galileo, JPL, NASA)

Copyright © 2002, 2005 by Wm. Robert Johnston. All rights reserved.
Last modified 20 August 2005.
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