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Life and Giant Planets
Jovian system, includes the edge of Jupiter with its Great Red Spot, and Jupiter's four largest moons, known as the Galilean satellites. From top to bottom, the moons shown are Io, Europa, Ganymede and Callisto.
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Saturn's Atmospheric Changes (Voyager View)
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Saturn's Atmospheric Closeup (Voyager) Northern Hemisphere of Saturn
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Saturn's B and C-rings (Voyager)
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View of Saturn's rings (Voyager)
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Europa's Frozen Surface, Jovian system
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Fractures of cracking Europa's frozen surface (Voyager 2)
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Cracks and Ridges Distorted by Europan Fault Motion (Galileo)
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A Record of Crustal Movement on Europa (Galileo)
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Chaos on Europa (Galileo)
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Jupiter's Electrical Storm (Polar Aurora seen by Hubble). Photo Credit: Hubble STScI Space Telescope Institute/NASA
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Europa Surface composition. The bright white and bluish part of Europa's surface is composed mostly of water ice, with very few non-ice materials. In contrast, the brownish mottled regions on the right side of the image may be covered by hydrated salts and an unknown red component. The yellowish mottled terrain on the left side of the image is caused by some other unknown component. Long, dark lines are fractures in the crust, some of which are more than 3,000 kilometers (1,850 miles) long.
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Pwyll Crater on Europa. Debris from the 16 mile wide crater scattered 100's of miles across the icy surface.
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Colorful Tupan Patera, Io Volcano, Jovian System
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Hot volcanic spots on Io, Jovian moon system
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Dynamic eruption at Tvashtar Catena, a chain of volcanic bowls on Jupiter's moon Io
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Dynamic eruption at Tvashtar Catena, a chain of volcanic bowls on Jupiter's moon Io
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Sources of Volcanic Plumes Near Prometheus, Io, Jupiter
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Ongoing Volcanic Eruption at Tvashtar Catena, Io, Jupiter
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Culann Patera, Io, in false color, Jupiter
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Ionian Mountains and Calderas, in Color, Jupiter
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Hubble Views Ancient Storm in the Atmosphere of Jupiter
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Ganymede, Jovian Moon
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This chain of 13 craters probably formed by a comet which was pulled into pieces by Jupiter's gravity as it passed too close to the planet. Soon after this breakup, the 13 fragments crashed onto Ganymede in rapid succession.
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Jovian Moon Callisto Global Mosaic
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Hubble Captures Volcanic Eruption Plume From Io
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Hubble Portrait Of Io And Jupiter
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Voyager 2 image of Jupiter's Moon Europa. Note the lack of impact craters and terrain smoothness from its icy surface
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Solar System Panorama (Not to scale)
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Jupiter's Ammonia highlighted near atmospheric circulation
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Io Volcanic surface-Galileo Image
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Io Eclipse with Volcanic Eruption of Enormous Scale Viewed by Galileo
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Although a full orbital solution for the satellites cannot be determined from only two Hubble measurements, it turns that their paths closely follow that expected for objects orbiting the Pluto system's barycenter in a perfect circle in the same plane as Charon's orbit. Credit: NASA, ESA, W.J. Merline (SwRI), and the Pluto Companion Search Team
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This illustration shows the Pluto system from the surface of one of the candidate moons. The other members of the Pluto system are just above the putative moon's surface. Pluto is the large disk at center right. Charon, the system's only confirmed moon, is the smaller disk to the right of Pluto. The other candidate moon is the bright dot on the far left. Credit: NASA, ESA and G. Bacon (STScI)
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These Hubble Space Telescope images, taken by the Advanced Camera for Surveys, reveal Pluto, its large moon Charon, and the planet's two new
putative satellites. In the short-exposure image [left], taken June 11,
2002, the candidate moons cannot be seen. They do, however, appear in the middle and right-hand images where longer exposure times were used. Credit: NASA, ESA, H. Weaver (JHU/APL), A. Stern (SwRI), and the Hubble Space Telescope Pluto Companion Search Team
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These Hubble Space Telescope images, taken by the Advanced Camera for
Surveys, reveal Pluto, its large moon Charon, and the planet's two new
candidate satellites. Credit: NASA, ESA, H. Weaver (JHU/APL), A. Stern (SwRI), and the Hubble Space Telescope Pluto Companion Search Team
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The asteroid 617 Patroclus and its companion are indicated by the green triangle in Jupiter's trailing Lagrange point. The white dots indicate the position of the 10,000 known asteroids in our solar system with diameters greater than 10 kolimeters. They cluster in the main asteroid belt between Mars and Jupiter, plus the two Lagrange points of Jupiter's orbit.
(Credit: IMCCE-Observatoire de Paris)
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617 Patroclus observed with the Keck-10m LGS AO system. The observations of this faint object (mv~15.8) were made possible using the LGS system. An artificial star (with mv~11) is created at proximity of the target, exciting the thin sodium layer at an altitude of ~100 km using a dye laser. The asteroid itself was used for the tip-tilt analysi. These observations were taken on 28 May 2005 with the NIRC-2 infrared camera through the H, centred at 1.6 microns (a), and Kp, centred at 2.2 microns (b) broadband filters. The angular resolution is estimated to 0.058 arcsec, close to the diffraction limit of the telescope (indicated by the scale bar, 50mas). The angular separation on the two images is 150 mas, corresponding to 640 km, close to the maximum apparent separation of the components. (credit: F. Marchis et al., Nature)
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Artist's rendering of the binary asteroids Patroclus (center) and Menoetius. Jupiter and its four Galilean satellites are visible in the distance, while the sun is out of sight to the left. The dirty snowballs probably are fugitives from the Kuiper Belt now hanging out in Jupiter's orbit. (Credit: W. M. Keck Observatory/Lynette Cook)
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The Keck-II Laser Guide Star system in operation on the top of Mauna Kea (credit: Sarah Anderson)
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It is thought that Jupiter's moon Europa may have an ocean of liquid water below it's icy surface. If environments similar to black smokers exist on Europa, they may be potential environments for life.
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Surface features of Europa's crust, geologic data and the presence of a magnetic field are some of the traits that have lead scientists to believe that an ocean is likely present on the Jovian moon today.
Credit: NASA
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Mercury is the planet nearest the sun and its mass is just 5-1/2 percent that of
Earth. The planet Mercury was first photographed in detail on March 29, 1974, by the
U.S. probe Mariner 10.

Credit: NASA
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This image shows a representation of the high-precision planetary radar technique,
where a signal is sent to Mercury and a reflection is received back at Earth.

Credit: Bill Saxton, NRAO/AUI/NSF
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With surface dimensions of 100 by 110 meters, the Robert C. Byrd Green Bank
Telescope is the world's largest fully steerable radio telescope.

Credit: National Radio Astronomy Observatory
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Saturn's distinctive moon Iapetus (eye-APP-eh-tuss) has been found to be
cryogenically frozen in the equivalent of its teenage years.
Credit: NASA/JPL/Space Science Institute
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Artist's impression of Charon (foreground) and Pluto (background). The plumes and
brighter spots depicted at left on Charon are thought to be created as water (with
some ammonia hydrate mixed in) "erupts" from deep beneath the surface.
Credit: Gemini Observatory. Composite image includes Pluto and Charon models
(enhanced), courtesy of Software Bisque., with plumes and ice
fields added by Mark C. Petersen, Loch Ness Productions. Star field from DigitalSky
2, courtesy Sky-Skan, Inc.
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