Jupiter as seen on approach by Voyager 1 in 1979. Notice the orange-colored moon in front of Jupiter. This is Io. The small white moon to the center-right is Europa. (Courtesy NASA/JPL).
The Great Red Spot is a giant storm on Jupiter that is more than 3 times the diameter of Earth across. (Courtesy NASA/JPL).
Artist renderings by David Seal of the Jet Propulsion Laboratory, Pasadena, California, showing the collision of Comet Shoemaker-Levy 9 with Jupiter. This impact event is expected to occur around July 21, 1994. The first view is from the vantage point of Earth. The second view is the perspective of Voyager 2. The third view is the perspective from above Jupiter's south pole. Renderings based on the data of Dr. Donald Yeomans and Dr. Paul Chodas.
Jupiter's moon Io has many active volcanoes. It's surface is one of the youngest in the Solar System (it rivals only the Earth). This picture taken by Voyager 2 in July 1979, shows two color-enhanced (blue) volcanic plumes erupting to heights of 100 km above the surface. Io is about the same size as Earth's Moon. (Courtesy NASA/JPL)
Jupiter on February 13, 1979. Voyager 1 was approaching the giant planet and captured this view showing the Great Red Spot, the satellite Io (orange moon on left), and Europa (brighter moon on right). (Courtesy NASA/JPL).
Callisto seen by Voyager 1 in March 1979. Callisto is about the size of the planet Mercury. It is a heavily-cratered moon, which contrasts starkly with Io. Io's surface is as young as Callisto's is old. Callisto probably consists of a mixture of ice and rock. When the Galileo spacecraft begins studying Jupiter's system in 1995-1997, some parts of Callisto are planned to be imaged at much higher resolution (greater detail) than was available from the Voyagers.