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Jupiter - MSN Encarta Jupiter orbits the Sun at an average distance of 778 million km (484 million mi), which is about five times the distance from Earth to the Sun. Jupiter’s year, or the time it takes to complete an orbit about the Sun, is 11.9 Earth years, and its day, or the time it takes to rotate on its axis, is about 9.9 hours, less than half an Earth day. Jupiter’s low density indicates that the planet is composed primarily of the lightest elements—hydrogen and helium. encarta.msn.com /encyclopedia_761564261/Jupiter_(planet).html   (1127 words)

Jupiter Jupiter is a gas giant, with 11 times the diameter of Earth, and two and half times the mass of all the other planets and satellites combined. Jupiter's immense atmosphere consists of about 75% hydrogen and 25% helium by mass (90% hydrogen and 10% helium by number of atoms), with trace amounts of methane, ammonia, and other light substances. Although Jupiter has virtually the same elemental composition as the Sun, it would have needed at least 10 times more mass in order to have become a brown dwarf, and about 80 times more mass in order to have initiated nuclear reactions and shone as a star. www.daviddarling.info /encyclopedia/J/Jupiter.html   (1061 words)

The Library - Astronomy - Jupiter Jupiter's rings and moons are embedded in an intense radiation belt of electrons and ions trapped in the magnetic field. A third ring, known as the gossamer ring because of its transparency, is actually three rings of microscopic debris from three small moons: Amalthea, Thebe, and Adrastea. Jupiter's ring system may be formed by dust kicked up as interplanetary meteoroids smash into the giant planet's four small inner moons. www.lunaroutpost.com /library/jupiter.htm   (613 words)

Jupiter Jupiter possesses 16 satellites, four of which - Callisto, Europa, Ganymede and Io - were observed by Galileo as long ago as 1610. The rings are very tenuous and are composed of dust particles kicked up as interplanetary meteoroids smash into Jupiter's four small inner moons Metis, Adrastea, Thebe, and Amalthea. Jupiter's rings and moons exist within an intense radiation belt of electrons and ions trapped in the planet's magnetic field. www.etsimo.uniovi.es /solar/eng/jupiter.htm   (2155 words)

Jupiter, rings Jupiter has a faint ring system with four main components: the halo ring, the main ring, and the two gossamer rings; it was first detected by Voyager 1. The main ring encompasses the orbits of the two innermost moons Adrastea and Metis, and at its inner edge merges into the halo, a broad, faint torus of material extending halfway from the main ring to Jupiter’s cloud-tops. Just outside the main ring are the broad and extremely faint gossamer rings, one bounded by the orbit of Amalthea, the other by the orbit of Thebe. www.daviddarling.info /encyclopedia/J/Jupiter_rings.html   (279 words)

Jupiter Jupiter is the fifth planet from the Sun and by far the largest. Jupiter was the King of the Gods, the ruler of Olympus and the patron of the Roman state. Jupiter and the other gas planets have high velocity winds which are confined in wide bands of latitude. library.thinkquest.org /20104/Planets/Jupiter.htm   (499 words)

StarDate Online | Solar System Guide | Jupiter   (Site not responding. Last check: 2007-11-06) Pioneer 10 found that Jupiter's interior is hotter than previously thought, discovered that the planet's radiation belts are strong enough to kill a human being, and discovered that Jupiter's moon Io is embedded in a giant cloud of hydrogen that encircles Jupiter. Rings encircle Jupiter, although they are far darker and skimpier than those of the flashier planet Saturn. The rings may consist of material that was "sandblasted" off the surfaces of Jupiter's moons by collisions with meteorites. stardate.org /resources/ssguide/jupiter.html   (891 words)

Jupiter Jupiter possesses 28 known satellites, four of which - Callisto, Europa, Ganymede and Io - were observed by Galileo as long ago as 1610. This true color mosaic of Jupiter was constructed from images taken by the Cassini spacecraft on December 29, 2000, during its closest approach to the giant planet at a distance of approximately 10 million kilometers (6.2 million miles). Jupiter's diameter is eleven times that of Earth, so the smallest storms on this mosaic are comparable in size to the largest hurricanes on Earth. www.solarviews.com /eng/jupiter.htm   (2771 words)

Cornell News: Source of Jupiter's rings "Rings are important dynamical laboratories to look at the processes that probably went on billions of years ago when the solar system was forming from a flattened disk of dust and gas," Burns explained. Jupiter's diameter is approximately 86,000 miles (143,000 kilometers). Galileo has been orbiting Jupiter and its moons for 2-1/2 years and is currently in the midst of a two-year extension, known as the Galileo Europa Mission. www.news.cornell.edu /releases/sept98/jupiter_rings.html   (929 words)

MIRA :: Field Trips to the Stars :: Jupiter Jupiter's magnetic field is the strongest of all the planets and was first detected in 1955 when radio noise was measured at 20 megahertz (15 meter wavelength). Jupiter's magnetic field is 19,000 times intrinsically stronger than Earth's, but since Jupiter's diameter is 11 times that of Earth, the field strength on its equator is measured to be 4.3 gauss, compared to 0.3 gauss on the surface of the Earth. Jupiter's rings cannot be seen from Earth because they are made up of dark and tiny silicate dust particles, which are so thinly distributed, that they block very little sunlight. www.mira.org /fts0/planets/099/text/txt002x.htm   (1223 words)

Mooning over the dust rings of Jupiter - photos reveal new information Science News - Find Articles   (Site not responding. Last check: 2007-11-06) Faint rings encircling Jupiter's equator between the planet and its large moon Io were discovered by the two Voyager craft in the late 1970s. The angles at which the satellites orbit Jupiter, relative to the planet's equatorial plane, correlate with the vertical extent, or height, of the rings. Saturn's famous rings, which are much more massive and contain larger, icy particles, are thought to have a different origin--either the breakup of a giant, frozen body or collisions between several large, icy moons. www.findarticles.com /p/articles/mi_m1200/is_n12_v154/ai_21189688   (830 words)

Jupiter Facts   (Site not responding. Last check: 2007-11-06) Jupiter is the fourth brightest object to be seen in the sky. Jupiter is a gas planet, composed largely of hydrogen (89%) and helium (11%), with traces of methane, water vapor, and ammonia. Jupiter, sometimes called Jove, was the King of the gods in Roman mythology and the son of Saturn. mars.sgi.com /worlds/CyberMarz/Jupiter/HTML/index.html   (270 words)

Jupiter The origin of the ring is probably from micrometeorite bombardment of the tiny moons orbiting within the ring. This dramatic view of Jupiter's Great Red Spot and its surroundings was obtained by Voyager 1 on Feb. 25, 1979, when the spacecraft was 9.2 million kilometers (5.7 million miles) from Jupiter. The ring of Jupiter was discovered by Voyager 1 in March of 1979. www.astro.cz /solar/eng/jupiter.htm   (1910 words)

Jupiter Galileo's discovery, in 1610, of Jupiter's four large moons Io, Europa, Ganymede and Callisto (now known as the Galilean moons) was the first discovery of a center of motion not apparently centered on the Earth. (Jupiter does NOT produce energy by nuclear fusion as in the Sun; it is much too small and hence its interior is too cool to ignite nuclear reactions.) This interior heat probably causes convection deep within Jupiter's liquid layers and is probably responsible for the complex motions we see in the cloud tops. The Galileo spacecraft found clear evidence that the rings are continuously resupplied by dust formed by micrometeor impacts on the four inner moons, which are very energetic because of Jupiter's large gravitational field. dept.physics.upenn.edu /nineplanets/jupiter.html   (2001 words)

Jupiter: The Largest Planet Jupiter is so large that all of the other planets in the solar system could fit inside of it. Jupiter is a large gas planet whose rapid rotation causes the planet to flatten at the poles and bulge at the equator. Jupiter's atmosphere is thought to be composed of hydrogen, helium, sulfur, and nitrogen. www.mtsu.edu /~mrb2t/Jupiter.htm   (434 words)

JUPITER - ENCHANTED LEARNING SOFTWARE This is because Jupiter is such a large planet (and the gravitational force a planet exerts upon an object at the planet's surface is proportional to its mass and to the inverse of its radius squared). Jupiter is made up of gases and liquids, so as it rotates, its parts do not rotate at exactly the same velocity. Galileo first discovered the four largest moons of Jupiter, Io (which is volcanically active), Europa, Ganymede (the largest of Jupiter's moons, pictured at the left), and Callisto in 1610; these moons are known as the Galilean moons. www.enchantedlearning.com /subjects/astronomy/planets/jupiter   (705 words)

Jupiter Jupiter is so big that it is close to the maximum diameter possible for a gas planet. Jupiter's composition is very similar to that of the primordial Solar nebula from which the Sun is formed. As with Earth and its Moon, Jupiter's rotation is gradually slowing down from the tidal drag of the large Galilean moons, and these tidal forces are also gradually causing the moons' orbits to move farther away from the planet. www.solstation.com /stars/jupiter.htm   (3030 words)

Jupiter - Astronomy for Kids   (Site not responding. Last check: 2007-11-06) Jupiter's diameter of over 85,000 miles is almost twelve times that of Earth and its mass is well over twice as much as all the rest of the planets put together. Jupiter's extremely large size has made it a favorite observation subject for professional and amateur astronomers ever since Galileo used his first primitive telescope almost four hundred years ago. A "day" on Jupiter is just a little over ten hours long, which means that not only is Jupiter huge, but it rotates very fast on its axis. www.dustbunny.com /afk/planets/jupiter   (914 words)

The Library - Astronomy - Jupiter - Kids Jupiter   (Site not responding. Last check: 2007-11-06) Jupiter's stripes and swirls are cold, windy clouds of ammonia and water. Jupiter's Great Red Spot is a giant storm as wide as three Earths. Jupiter also has three rings, but they are very hard to see and not nearly as pretty as Saturn's. www.lunaroutpost.com /library/astronomy_kids/kid_jupiter.htm   (383 words)

The Rings of Jupiter Unlike Saturn's rings, which are clearly visible from Earth even through small telescopes, Jupiter's rings are very difficult to see. Jupiter's rings were first found by the Voyager 1 spacecraft in 1979. Jupiter's rings are different - they are very dark and difficult to see. www.windows.ucar.edu /tour/link=/jupiter/rings.html   (227 words)

Time for Kids | Magazines | Rings Around Jupiter Bits of asteroids and comets, known as meteoroids, are drawn toward Jupiter by the tremendous force of its gravity. The brighter main ring, which is close to Jupiter, seemed to be framed by the orbits of two moons, Metis and Adrastea. Uranus and Neptune also have dark, dusty rings and multiple moons, and scientists now say it's a pretty safe bet that their rings are formed in the same way. www.timeforkids.com /TFK/magazines/story/0,6277,88519,00.html   (722 words)

Rings of Jupiter - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-11-06) Jupiter has a faint planetary ring system composed of smoke-like dust particles knocked off of its moons by meteor impacts. The main ring is made of dust from the satellites Adrastea and Metis. Inside the main ring is a torus of faint particles known as the halo. en.wikipedia.org /wiki/Rings_of_Jupiter   (210 words)

Space Today Online - Exploring Jupiter System - Jupiter the Planet Jupiter is the fifth planet outward from the Sun and the largest planet in our Solar System. Jupiter is the most massive planet in our Solar System and it has dozens of moons. Jupiter's rings surprised astronomers when they were discovered by the Voyager-1 probe in 1979 and confirmed by Galileo in 1998. www.spacetoday.org /SolSys/Jupiter/JupiterPlanet.html   (228 words)

Dark Rings Unlike Saturn's rings, which are made of bright, icy chunks as large as houses, Jupiter's rings consist of fine dust akin to the particles in cigarette smoke. Jupiter's rings, on the other hand, are merely dust from the surface of such moons. Jupiter's magnetosphere (a magnetic bubble that surrounds the planet) is filled with electrified clouds called plasmas. science.nasa.gov /headlines/y2002/08nov_gossamer.htm   (1096 words)

Astronomers crack Jupiter ring The second ring, inside Amalthea's orbit, and the third ring, inside the orbit of Thebe, were barely visible to Voyager. But it also confirmed the existence of two thick but faint 'gossamer' rings and they say their cylindrical shape appears to prove just where the dust is coming from. She says photos of the four inner moons of Jupiter show they are regular targets of meteoroids drawn inward by the planet's enormous gravity. www.exn.ca /html/templates/printstory.cfm?ID=1998091561   (727 words)

Jupiter's Rings   (Site not responding. Last check: 2007-11-06) The lower part of the ring nearest the planet is in shadow. The ring also efficiently scatters light, indicating that much of its brightness is due to particles that are microns or less in diameter. This vertically extended "halo" is unusual in planetary rings, and is probably caused by electromagnetic forces pushing the smallest grains out of the ring plane. www.resa.net /nasa/rings.htm   (207 words)

BBC News | Sci/Tech | Jupiter's ring riddle solved The main ring, outside this, is formed from the dust of two moons. Huge as the rings may be, the dust particles are very thinly spread, each being about 30 metres from the other. The tiny particles that form the ring have a limited lifespan, but they are constantly being replaced by fresh particles, therefore the rings never increase in size or density. news.bbc.co.uk /1/hi/sci/tech/172602.stm   (461 words)

Did Meier Know About Jupiter's Rings First? According to our calculations and the flight path of the probe, it has to pass very closely by Jupiter and several of its moons, which means that good results would have to be achieved, if the apparati of the exploration unit work flawlessly. Unlike Saturn's bright rings which are composed of chunks of rock and ice, Jupiter's rings appear to consist of fine particles of dust. The gas giant planets, Jupiter, Saturn, Uranus, and Neptune are all known to have rings. www.rense.com /general35/jup.htm   (3299 words)

Scientists: Jupiter's rings are dust The faint rings around Jupiter come from clouds of dust that are the result of cosmic debris battering Jupiter's small moons, according to data from the Galileo spacecraft. The rings -- which are nearly invisible to even the best telescopes -- clearly show their relation to the orbits of four small inner moons, scientists said Tuesday. It was long thought that the only ringed planet was Saturn, with its prominent, icy bands, but the Voyager spacecraft revealed in 1979 that Jupiter also was surrounded by rings. www.canoe.ca /SpaceArchive/sep16_jupiter.html   (395 words)

CNN - Galileo sends back details of Jupiter's rings - September 15,1998 The scientists said that the rings serve as dynamic laboratories to help them understand how the solar system was formed billions of years ago. Galileo has also sent back pictures of Jupiter's four inner moons, which appear to be dark red and covered with craters from meteor impacts. Voyager revealed that Jupiter's rings include a flattened, main ring, and an inner, cloud-like ring called a halo. www.cnn.com /TECH/space/9809/15/jupiters.rings/index.html   (384 words)

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