These images show Jupiter's moon Io obtained at different infrared wavelengths with the W. M. Keck Observatory's 10-meter Keck II telescope on Aug. 15, 2013 (a-c), and the Gemini North telescope on Aug. 29, 2013 (d).
Possible 'Moonwich' of Ice and Oceans on Ganymede (Artist's Concept)
This artist's concept of Jupiter's moon Ganymede, the largest moon in the solar system, illustrates the 'club sandwich' model of its interior oceans. Scientists suspect Ganymede has a massive ocean under an icy crust.
This map composed of images NASA's Galileo and Voyager missions shows the hemisphere of Europa that might be affected by plume deposits. The view is centered at -65 degrees latitude, 183 degrees longitude.
This is a frame from an animation of a rotating globe of Jupiter's moon Ganymede, with a geologic map superimposed over a global color mosaic, incorporating the best available imagery from NASA's Voyager 1 and 2 spacecraft, and Galileo spacecraft.
Ganymede Global Geologic Map and Global Image Mosaic
To present the best information in a single view of Jupiter's moon Ganymede, a global image mosaic was assembled, incorporating the best available imagery from NASA's Voyager 1 and 2 spacecraft and NASA's Galileo spacecraft.
This graphic shows the location of water vapor detected over Europa's south pole in observations taken by NASA's Hubble Space Telescope in December 2012. This is the first strong evidence of water plumes erupting off Europa's surface.
This is an artist's concept of a plume of water vapor thought to be ejected off the frigid, icy surface of the Jovian moon Europa, located about 500 million miles (800 million kilometers) from the sun.
This map shows the distribution of water in the stratosphere of Jupiter as measured with the Herschel space observatory. White and cyan indicate highest concentration of water, and blue indicates lesser amounts.
Vortices Bump into a Hot Spot in Jupiter's Atmosphere
In this series of images from NASA's Cassini spacecraft, a dark, rectangular hot spot interacts with a line of vortices that approaches from on the upper-right side. The interaction distorts the shape of the hot spot, leaving it diminished.
The dark hot spot in this false-color image from NASA's Cassini spacecraft is a window deep into Jupiter's atmosphere. All around it are layers of higher clouds, with colors indicating which layer of the atmosphere the clouds are in.
Repeated Flybys Yield a Pole-to-Pole View of Europa
This view of Jupiter's moon Europa features several regional-resolution mosaics overlaid on a lower resolution global view for context. The regional views were obtained during several different flybys of the moon by NASA's Galileo mission.
Taste of the Ocean on Europa's Surface (Artist's Concept)
Based on new evidence from Jupiter's moon Europa, astronomers hypothesize that chloride salts bubble up from its global liquid ocean and reach the frozen surface where they are bombarded with sulfur from volcanoes on Jupiter's innermost large moon, Io.
Jupiter has been suffering more impacts over the last four years than ever previously observed, including this meteoroid impact on Sept. 10, 2012. Right-hand image is an infrared image NASA's Infrared Telescope Facility on Mauna Kea, Hawaii.