ow many moons does jupiter have?
816595
It was 63 at the last census. Saturn has 56, Uranus 27, Neptune 13, Mars 2 and Earth 1 making 162 planetary moons in all,\n\nFirst to be discovered (in European culture)  were Io, Callisto, Europa and Ganymede in January 1610, by Galileo. But the Chinese astronomer Gan De is reported to have seen one of the moons of Jupiter (possibly Ganymede) with his naked eye in 364 BC,  Nearly 2,000 years earlier.\n\n15 of the moons still lack a name, and only have a designation. In order outwards from the planet, with their orbital periods, the 63 are as follows:\n\n1 Metis 7h 4m 29s\n2 Adrastea 7h 9m 30s\n3 Amalthea 11h 57m 22.67s\n4 Thebe 16h 11m 17s\n5 Io 1.77 days\n6 Europa 3.55 days\n7 Ganymede 7.15 days \n8 Callisto 16.69 days \n9 Themisto 129.87 days\n10 Leda 241.75 days \n11 Himalia 250.37 days \n12 Lysithea 259.89 days \n13 Elara 261.14 days \n14 S/2000 J 11 287.93 days \n15 Carpo 458.62 days \n16 S/2003 J 12 482.69 days \n17 Euporie 538.78 days \n18 S/2003 J 3  561.52 days \n19 S/2003 J 18  569.73 days \n20 Thelxinoe 597.61 days \n21 Euanthe 598.09 days \n22 Helike 601.40 days \n23 Orthosie 602.62 days\n24 Iocaste 609.43 days \n25 S/2003 J 16 610.36 days \n26 Praxidike 613.90 days \n27 Harpalyke 624.54 days \n28 Mneme 627.48 days \n29 Hermippe 629.81 days\n30 Thyone 639.80 days \n31 Ananke 642.02 days \n32 S/2003 J 17  672.75 days\n33 Aitne 679.64 days \n34 Kale 685.32 days \n35 Taygete 686.67 days \n36 S/2003 J 19  699.12 days \n37 Chaldene 699.33 days\n38 S/2003 J 15  699.68 days\n39 S/2003 J 10  700.13 days\n40 S/2003 J 23  700.54 days\n41 Erinome 711.96 days \n42 Aoede 714.66 days \n43 Kallichore 717.81 days \n44 Kalyke 721.02 days \n45 Carme 721.82 days \n46 Callirrhoe 722.62 days\n47 Eurydome 723.36 days\n48 Pasithee 726.93 days \n49 Cyllene 731.10 days \n50 Eukelade 735.20 days \n51 S/2003 J 4 739.29 days  \n52 Pasiphaë 741.09 days \n53 Hegemone 745.50 days \n54 Arche 746.19 days \n55 Isonoe 750.13 days \n56 S/2003 J 9  752.84 days\n57 S/2003 J 5  758.34 days \n58 Sinope 762.33 days \n59 Sponde 771.60 days\n60 Autonoe 772.17 days \n61 S/2003 J 14 776.02 days \n62 Megaclite 792.44 days \n63 S/2003 J 2  1077.02 days
523525
UB-313 (also known as "Xena"). This is the only "tenth planet" that has a moon and is larger than Pluto.\n\nThere are several other "planetoids" or "plutinos" including Sedna, Quaoar, Ixion, Varuna, and Orcus.
838305
B is wrong.  Jupiter spins once every 9 hours and 55 minutes while earth spins once every 24.
365063
As of April 18th, 2006 we know of 152 planetary systems other than our own containing a total of 176 planets.  This number grows fairly frequently as more and more observations are being made.
209591
From our small world we have gazed upon the cosmic ocean for thousands of years. Ancient astronomers observed points of light that appeared to move among the stars. They called these objects planets, meaning wanderers, and named them after Roman deities - Jupiter, king of the gods; Mars, the god of war; Mercury, messenger of the gods; Venus, the god of love and beauty, and Saturn, father of Jupiter and god of agriculture. The stargazers also observed comets with sparkling tails, and meteors or shooting stars apparently falling from the sky.\n\nSince the invention of the telescope, three more planets have been discovered in our solar system: Uranus (1781), Neptune (1846), and Pluto (1930). In addition, there are thousands of small bodies such as asteroids and comets. Most of the asteroids orbit in a region between the orbits of Mars and Jupiter, while the home of comets lies far beyond the orbit of Pluto, in the Oort Cloud.\n\nThe four planets closest to the Sun - Mercury, Venus, Earth, and Mars - are called the terrestrial planets because they have solid rocky surfaces. The four large planets beyond the orbit of Mars - Jupiter, Saturn, Uranus, and Neptune - are called gas giants. Tiny, distant, Pluto has a solid but icier surface than the terrestrial planets.\n\nNearly every planet - and some of the moons - has an atmosphere. Earth's atmosphere is primarily nitrogen and oxygen. Venus has a thick atmosphere of carbon dioxide, with traces of poisonous gases such as sulfur dioxide. Mars' carbon dioxide atmosphere is extremely thin. Jupiter, Saturn, Uranus, and Neptune are primarily hydrogen and helium. When Pluto is near the Sun, it has a thin atmosphere, but when Pluto travels to the outer regions of its orbit, the atmosphere freezes and collapses to the planet's surface. In that way, Pluto acts like a comet.\n\nThere are 154 known natural satellites (also called moons) in orbit around the various planets in our solar system, ranging from bodies larger than our own Moon to small pieces of debris. Many of these were discovered by planetary spacecraft. Some of these have moons have atmospheres (Saturn's Titan); some even have magnetic fields (Jupiter's Ganymede). Jupiter's moon Io is the most volcanically active body in the solar system. An ocean may lie beneath the frozen crust of Jupiter's moon Europa, while images of Jupiter's moon Ganymede show historical motion of icy crustal plates. Some planetary moons may actually be asteroids that were captured by a planet's gravity. The captured asteroids presently counted as moons may include Phobos and Deimos, several satellites of Jupiter, Saturn's Phoebe, many of Uranus' new satellites, and possibly Neptune's Nereid.\n\nFrom 1610 to 1977, Saturn was thought to be the only planet with rings. We now know that Jupiter, Uranus, and Neptune also have ring systems, although Saturn's is by far the largest. Particles in these ring systems range in size from dust to boulders to house sized, and may be rocky and/or icy.\n\nMost of the planets also have magnetic fields which extend into space and form a magnetosphere around each planet. These magnetospheres rotate with the planet, sweeping charged particles with them. The Sun has a magnetic field, the heliosphere, which envelops our entire solar system.\n\nAncient astronomers believed that the Earth was the center of the Universe, and that the Sun and all the other stars revolved around the Earth. Copernicus proved that Earth and the other planets in our solar system orbit our Sun. Little by little, we are charting the Universe, and an obvious question arises: Are there other planets where life might exist? Only recently have astronomers had the tools to indirectly detect large planets around other stars in nearby solar systems.\n\nSo basically the inner plantes have solid ground. The outer are made of gas except pluto.\n-good luck
113046
Saturn has lots of moons, most are gas but not all, try this website www.findspace/saturn/moons.com  that is if the site is still running, I heared it may close down soon, but I went on it yesterday so it should still be there...
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Jupiter is the largest planet in the solar system. Its diameter is 88,846 miles (142,984 kilometers), more than 11 times that of Earth, and about one-tenth that of the sun. It would take more than 1,000 Earths to fill up the volume of the giant planet. When viewed from Earth, Jupiter appears brighter than most stars. It is usually the second brightest planet -- after Venus.\n\nJupiter is the fifth planet from the sun. Its mean (average) distance from the sun is about 483,780,000 miles (778,570,000 kilometers), more than five times Earth's distance. Ancient astronomers named Jupiter after the king of the Roman gods.\n\nAstronomers have studied Jupiter with telescopes based on Earth and aboard artificial satellites in orbit around Earth. In addition, the United States has sent six space probes (crewless exploratory craft) to Jupiter.\n\nAstronomers witnessed a spectacular event in July 1994, when 21 fragments of a comet named Shoemaker-Levy 9 crashed into Jupiter's atmosphere. The impacts caused tremendous explosions, some scattering debris over areas larger than the diameter of Earth.\n\nPhysical features of Jupiter\n\nJupiter is a giant ball of gas and liquid with little, if any, solid surface. Instead, the planet's surface is composed of dense red, brown, yellow, and white clouds. The clouds are arranged in light-colored areas called zones and darker regions called belts that circle the planet parallel to the equator.\n\nOrbit and rotation\n\nJupiter travels around the sun in a slightly elliptical (oval-shaped) orbit. The planet completes one orbit in 4,333 Earth days, or almost 12 Earth years.\n\nAs Jupiter orbits the sun, the planet rotates on its axis, an imaginary line through its center. The axis is tilted about 3¡. Scientists measure tilt relative to a line at a right angle to the orbital plane, an imaginary surface touching all points of the orbit.\n\nJupiter rotates faster than any other planet. It takes 9 hours 56 minutes to spin around once on its axis, compared with 24 hours for Earth. Scientists cannot measure the rotation of the interior of the giant planet directly, so they have calculated the speed from indirect measurements. They first calculated the speed using an average of the speeds of the visible clouds that move with interior currents, except for a more rapid zone near the equator.\n\nJupiter sends out radio waves strong enough to be picked up by radio telescopes on Earth. Scientists now measure these waves to calculate Jupiter's rotational speed. The strength of the waves varies under the influence of Jupiter's magnetic field in a pattern that repeats every 9 hours 56 minutes. Because the magnetic field originates in Jupiter's core, this variation shows how fast the plant's interior spins.\n\nJupiter's rapid rotation makes it bulge at the equator and flatten at the poles. The planet's diameter is about 7 percent larger at the equator than at the poles.\n\nMass and density\n\nJupiter is heavier than any other planet. Its mass (quantity of matter) is 318 times larger than that of Earth. Although Jupiter has a large mass, it has a relatively low density. Its density averages 1.33 grams per cubic centimeter, slightly more than the density of water. The density of Jupiter is about 1/4 that of Earth. Because of Jupiter's low density, astronomers believe that the planet consists primarily of hydrogen and helium, the lightest elements. Earth, on the other hand, is made up chiefly of metals and rock. Jupiter's mix of chemical elements resembles that of the sun, rather than that of Earth.\n\nJupiter may have a core made up of heavy elements. The core may be of about the same chemical composition as Earth, but 20 or 30 times more massive.\n\nThe force of gravity at the surface of Jupiter is up to 2.4 times stronger than on Earth. Thus, an object that weighs 100 pounds on Earth would weigh as much as 240 pounds on Jupiter.\n\nThe atmosphere of Jupiter is composed of abou
934797
Jupiter has a diameter equal to 11.2 times the diameter of Earth.  In terms of volume, the ratio is 11.2^3 = 1405.
678590
Yes, moons are satellites
235413
Neptune has 13 known moons. The largest by far, and the only one massive enough to be spheroidal, is Triton, discovered by William Lassell just 17 days after the discovery of Neptune itself. Unlike all other large planetary moons, Triton has a retrograde orbit, indicating that it was captured, and probably represents the largest known example of a Kuiper Belt object (although clearly no longer in the Kuiper Belt). It is close enough to Neptune to be locked into a synchronous orbit, and is slowly spiraling inward. Triton is the coldest object that has been measured in the solar system.\n\nNeptune's second known satellite, the irregular moon Nereid, has one of the most eccentric orbits of any satellite in the solar system.\n\nFrom July to September 1989, Voyager 2 discovered six new Neptunian moons. Of these, the irregularly shaped Proteus is notable for being as large as a body of its density can be without being pulled into a spherical shape by its own gravity. Although the second most massive Neptunian moon, it is only one quarter of one percent of the mass of Triton. Neptune's innermost four moons, Naiad, Thalassa, Despina, and Galatea, orbit close enough to be within Neptune's rings. The next farthest out, Larissa was originally discovered in 1981 when it had blocked a star. This was attributed to ring arcs, but when Voyager 2 observed Neptune in 1989, it was found to have been caused by the moon. Five new irregular moons discovered between 2002 and 2003 were announced in 2004.
1184119
Jupiter is further from the sun, and has a larger orbital path.  That is why it takes longer (it has to travel further to go around)
85518
Several:\n\nVenus. \nJupiter.\nSaturn\nNeptune.\nUranus.\n\n\nAnd some moons have clouds:\n\nJupiter's Galilean moons Io, Europa, Ganymede and Callisto have dust clouds from micrometeorites. \n\nSaturn's moon titan has methane clouds apparently.
381469
I assume that the question is How many planets do not HAVE moons. If that is the case, then the answer is 2, Mercury and Venus. All of the other planets have at least one moon.
619092
not really. To have planets and moons it has to have a gravitational pull
973173
There are more stars than we can count.  Most of them have planets.   Most of those planets have moons.
6652
Mercury has no known moons.\nhttp://solarsystem.nasa.gov/planets/profile.cfm?Object=Mercury&Display=Moons
1084800
There are 47 known moons. You can answer you're own question by going here.\nhttp://sci.esa.int/science-e/www/object/index.cfm%3Ffobjectid%3D35229