does anyone know any intersting facts about the planet(s) uranus, neptune and/or pluto?
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There is debate over whether Pluto should even be classified as a planet.  It seems out of place with the gas giants of the outer solar system beyond the rock belt.  Also, other similar bodies are being found beyond Pluto that are not being made "planets".  Finally, Pluto has a satellite, or "moon", Charon, which is actually almost as big as Pluto istelf, and orbits very, very close to Pluto.  From Earth, they barely resolve (depending on the quality of the instrument) and appear joined at the hip as it were.  Pluto takes 248 years to orbit the sun.  Since it was discovered in 1930, man has not even observed one of its completed orbits around the sun.  Pluto follows an extremely exaggerated elliptical orbit, which actually crosses paths with the orbit of Neptune.  Thus, sometimes Neptune is the furthest planet from the sun, other times it is Pluto.\n\nUranus rotates about its own axis which is "sideways" (a relative term), at 98 degrees tilt.\n\nNeptune has a Great Dark Spot, which is a storm similar to the Great Red Spot of Jupiter.
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Mercury, Venus, Mars, Jupiter, and Saturn were all known in ancient times.  They are named after Roman mythological figures (other societies had different names for them, but the Roman names are what we use in the West).  Uranus (1700s), Neptune (1800s), and Pluto (1930) were discovered after the invention of the telescope, but the tradition of Roman Gods was continued by the discoverers.  The only discoverer's name I can remember is the famous astronomer William Herschel, who discovered Uranus.  I'm sure you can find out the names of Neptune's and Pluto's discoverers with a Google search.
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the planet?Pluto is the farthest planet from the Sun (usually) and by far the smallest. Pluto is smaller than seven of the solar system's moons (the Moon, Io, Europa, Ganymede, Callisto, Titan and Triton). \n\n        orbit:    5,913,520,000 km (39.5 AU) from the Sun (average)\n        diameter: 2274 km\n        mass:     1.27e22 kg\nIn Roman mythology, Pluto (Greek: Hades) is the god of the underworld. The planet received this name (after many other suggestions) perhaps because it's so far from the Sun that it is in perpetual darkness and perhaps because "PL" are the initials of Percival Lowell. \nPluto was discovered in 1930 by a fortunate accident. Calculations which later turned out to be in error had predicted a planet beyond Neptune, based on the motions of Uranus and Neptune. Not knowing of the error, Clyde W. Tombaugh at Lowell Observatory in Arizona did a very careful sky survey which turned up Pluto anyway. \nAfter the discovery of Pluto, it was quickly determined that Pluto was too small to account for the discrepancies in the orbits of the other planets. The search for Planet X continued but nothing was found. Nor is it likely that it ever will be: the discrepancies vanish if the mass of Neptune determined from the Voyager 2 encounter with Neptune is used. There is no Planet X. But that doesn't mean there aren't other objects out there, only that there isn't a relatively large and close one like Planet X was assumed to be. In fact, we now know that there are a very large number of smaller objects in the Kuiper Belt beyond the orbit of Neptune. \nPluto is the only planet that has not been visited by a spacecraft. Even the Hubble Space Telescope can resolve only the largest features on its surface (left and above). A spacecraft called New Horizons was launched in January 2006. If all goes well it should reach Pluto in 2015. \nFortunately, Pluto has a satellite, Charon. By good fortune, Charon was discovered (in 1978) just before its orbital plane moved edge-on toward the inner solar system. It was therefore possible to observe many transits of Pluto over Charon and vice versa. By carefully calculating which portions of which body would be covered at what times, and watching brightness curves, astronomers were able to construct a rough map of light and dark areas on both bodies. \nIn late 2005, a team using the Hubble Space Telescope discovered two additional tiny moons orbiting Pluto. Provisionally designated S/2005 P1 and S/2005 P2, they will be assigned real names when the discovery is confirmed. They are estimated to be between 60 and 200 kilometers in diameter. \nPluto's radius is not well known. JPL's value of 1137 is given with an error of +/-8, almost one percent. \nThough the sum of the masses of Pluto and Charon is known pretty well (it can be determined from careful measurements of the period and radius of Charon's orbit and basic physics) the individual masses of Pluto and Charon are difficult to determine because that requires determining their mutual motions around the center of mass of the system which requires much finer measurements -- they're so small and far away that even HST has difficulty. The ratio of their masses is probably somewhere between 0.084 and 0.157; more observations are underway but we won't get really accurate data until a spacecraft is sent. \nPluto is the second most contrasty body in the Solar System (after Iapetus). \nThere are some who think Pluto would be better classified as a large asteroid or comet rather than as a planet. Some consider it to be one of the larger Kuiper Belt objects (also known as Trans-Neptunian Objects). There is considerable merit to the latter position, but historically Pluto has been classified as a planet and it is very likely to remain so. Further complicating the situation, one such object (2003UB313) was recently discovered that is almost certainly larger than Pluto. Should it, too, be classified as
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The International Astronomical Union decided that Pluto was no longer a planet.  Instead, they decided to classify it as a "dwarf planet".\n\nSee the details below.\n\nRESOLUTION 5A\nThe IAU therefore resolves that "planets" and other bodies in our Solar System, except satellites, be defined into three distinct categories in the following way:\n\n(1) A "planet" [footnote 1] is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.\n\n(2) A "dwarf planet" is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape [footnote 2] , (c) has not cleared the neighbourhood around its orbit, and (d) is not a satellite.\n\n(3) All other objects [footnote 3] except satellites orbiting the Sun shall be referred to collectively as "Small Solar-System Bodies".\n\n\nFootnote 1: The eight "planets" are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.\n\nFootnote 2: An IAU process will be established to assign borderline objects into either dwarf planet and other categories.\n\nFootnote 3: These currently include most of the Solar System asteroids, most Trans-Neptunian Objects (TNOs), comets, and other small bodies.\n\nRESOLUTION 6A\nThe IAU further resolves:\n\nPluto is a "dwarf planet" by the above definition and is recognized as the prototype of a new category of trans-Neptunian objects.
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Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto.  Sometimes...Uranus, Pluto, Neptune.  Pluto has an unusual orbit.  Sometimes it crosses Neptune's path, making it closer to the sun than Neptune.
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This directory should give you the north polar CC for all the planets out to Pluto; the southern ones should be easy to extrapolate from these figures.\n\nhttp://nssdc.gsfc.nasa.gov/planetary/planetfact.html
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1.  Pluto, Sedna, Eris, Ceres, etc. are still planets but they are a specific class of planets ("dwarf planets").  This is similar to the Sun being classifed as a "yellow dwarf" but it's still a star.\n\nNow that I've got that off my chest, Pluto and Sedna are members of the Kuiper Belt, a collection of bodies that extend from about Neptune's orbit out to where the Oort Cloud is supposed to begin.  The Kuiper Belt is approximately co-planar with the ecliptic but extends farther away from the central plane of the solar system.  This definition allows Pluto, whose orbital inclination is significantly larger than average to be included in the Kuiper Belt.\n\nAstronomers are consistently finding more members of the Kuiper Belt through photographic review.  Most are smaller than Pluto, Sedna and Eris, some are similar in size and there is likely to be at least one more body that will be larger.
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mercury venus earth mars jupiter saturn uranus neptune pluto
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Jupiter, Neptune, Saturn, and Uranus. Venus has a lot of gas on it, but it actually has a inner core and crust just like the earth does. Pluto is thought to be either an astroid or comet caught by the suns gravity. Something else that's cool is Neptune and Uranus both have rings around them just like Saturn does.
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Sun, mercury, venus, earth, mars, Jupiter, Saturn, Uranus, Neptune, pluto.\n\nThis is second grade stuff.
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The nine planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune(sometimes Pluto), and Pluto(sometimes Neptune).
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For more info that you could possibly want to know:\nhttp://en.wikipedia.org/wiki/Jupiter_(planet)
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astronomers are trying to define the word planet but it isn't easy. many astronomers favor the reclassification of the bodies in the solar system into three groups, the rocky terrestrials, the gas giants, and the ice dwarfs. there are hundreds of bodies that orbit the sun farther than neptune known. these include bodies like pluto, quaoar, sedna, 2003 EL61, and 2003 UB313 (the official name of xena). this is also called the kuiper belt. pluto was the first kuiper belt object discovered, and 2003 UB313 is about five percent bigger than pluto.\n\n\nread this:\nhttp://en.wikipedia.org/wiki/Kuiper_belt
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These are good questions. I do not think anyone knows exactly, but I have heard the conjecture often that Pluto is an escaped moon or a captured planet from somewhere else, and was not present at the formation of the Solar System. Also it is possible that Pluto's strange orbit is the result of some collision. \n\nThe rotational angular momentum of Uranus is quite different from the other planets. It's rotational axis is tilted significantly from the orthogonal to the ecliptic (plane of orbits of most planets), and it is said to rotate in the "opposite" sense to earth and the sun and some of the other planets. However, since the tilt of Uranus' rotational axis is roughly 97.92 degrees, I do not know how strongly I would want to assert that it rotates in the opposite or retrograde sense to most of the other bodies in the solar system. Again, this could be caused by a collision. In one of the attached references, it is claimed that this could be caused by a tidal effect, but it is hard for me to understand how. \n\nIt turns out that both Pluto and Venus also rotate in a retrograde sense, so it is not that uncommon, although theories of the origin of the solar system imply that one would not expect a lot of deviations of angular momentum from the major direction of angular momentum in the system. In the case of our system, especially given the orbits of the planets with small inclinations to the ecliptic, and the very large angular momenta of the Sun, Jupiter and Saturn, this is basically correct. \n\nNeptune is probably called the blue planet because it is blue, although of course Uranus and Earth are blue as well (for different reasons). Neptune's blue is at least partly caused by the presence of methane in its atmosphere.
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There are alot of objects that exist beyond Pluto. Yet, at this point none of these is really large enough to be considered a planet. Check the source link for more info.
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My guess:\n\nIn Roman mythology Pluto is the God of the underworld, which is all cold and dark.  The ninth planet is also cold and dark.  Hence, the name.
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Don't forget the tenth planet "Xena"\n\nSome info on the planets:\n\nhttp://beaker.atspace.org/spaceglossplanets.htm