how many planets are in our solar system (including the ones just found)?
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There are ten planets in our solar system namely mercury,venus,earth mars,jupiter,saturn,uranus,neptune,pluto\nand\n2003-UB313 is the official name of the object that is considered to be a contender for the title of "10th planet". As of August 1st, 2005 the IAU has yet to confirm whether this object will be officially be recognized as the 10th planet in our solar system. This little page will follow events and provide more information when available.\nOfficial Name:  2003 UB313  \nProposed Name:  Unknown\nThe name Xena is rumored to be the name submitted to the IAU for approval, althought there is no official confirmation of the name. "..that was our tongue-in-cheek internal name, never intended for public consumption," says Professor Brown \nDiscovered By: Michael Brown, professor of planetary astronomy at California Institute of Technology (Caltech) and colleagues Chad Trujillo of the Gemini Observatory and David Rabinowitz of Yale University.\n\nFirst photographed in 2003 using a 122cm telescope at the Palomar Observatory. \n \nEstimated Size:  approx 2700 km (1,700 miles) in diameter\nThis is the estimate as of August, 2005. From Wikipedia - Although the object's diameter is not yet well determined, it is estimated to be between 2,390 and 3,550  km . The amount of light it reflects (its albedo ) seems to be quite high, and initial observations show that methane ice is present on the object's surface. Both these properties make it more similar to Pluto than previously discovered large outer solar system planetoids .  \nOrbit: 560 years \nestimated one solar orbit per 560 years.  \nDistance from Sun:\n approx 9 billion miles / 14.4 billion km\nThis is around 100 times the Earth's distance, or 3 times Pluto's distance from the Sun. \nWhere is it Now?  At present, it is near its farthest point from Earth, but in about 280 years, it will be as close as Neptune, (the eighth planet, discovered in 1846).
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we already found a 10th planet in our solar system, but it's still unclear if it's considered as planet (some say it is too small).\nThe name of the "10th planet" is Sedna.
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The Solar System or solar system[1] comprises the Sun and the retinue of celestial objects gravitationally bound to it: the eight planets, their 162 known moons,[2] three currently identified dwarf planets and their four known moons, and thousands of small bodies. This last category includes asteroids, meteoroids, comets, and interplanetary dust.\n\nThe principal component of the Solar System is the Sun or Sol (astronomical symbol ); a main sequence G2 star that contains 99.86% of the system's known mass and dominates it gravitationally.[3] The Sun's large mass gives it an interior density high enough to sustain nuclear fusion, releasing enormous amounts of energy, most of which is radiated into space in the form of electromagnetic radiation including visible light. Jupiter and Saturn are the Sun's two largest orbiting bodiesand account for more than 90% of the system's remaining mass. (The currently hypothetical Oort cloud would also hold a substantial percentage were its existence confirmed).[4]\n\nIn broad terms, the charted regions of the Solar System consist of the Sun, four rocky bodies close to it called the terrestrial planets, an inner belt of rocky asteroids, four gas giant planets and an outer belt of small icy bodies known as the Kuiper belt. In order of their distances from the Sun, the planets are Mercury (), Venus (), Earth (), Mars (), Jupiter (), Saturn (), Uranus (), and Neptune (). All planets but two are in turn orbited by natural satellites (usually termed "moons" after Earth's Moon) and every planet past the asteroid belt is encircled by planetary rings of dust and other particles. The planets other than Earth are named after gods and goddesses from Greco-Roman mythology.\n\nFrom 1930 to 2006, Pluto (), the largest known Kuiper belt object, was considered the Solar System's ninth planet. However, in 2006 the International Astronomical Union (IAU) created an official definition of the term "planet".[5] Under this definition, Pluto is reclassified as a dwarf planet, and there are eight planets in the Solar System. In addition to Pluto, the IAU currently recognizes two other dwarf planets: Ceres (), the largest object in the asteroid belt, and Eris, which lies beyond the Kuiper belt in a region called the scattered disc. Of the known dwarf planets, only Ceres has no moons.\n\nFor many years, the Solar System was the only known example of planets in orbit around a star. The discovery in recent years of many extrasolar planets has led to the term "solar system" being applied generically to all the newly discovered systems. Technically, however, it should strictly refer to Earth's system only, as the word "solar" is derived from the Sun's Latin name, Sol. Other such systems are usually referred to by the names of their parent star: "the Alpha Centauri system" or "the 51 Pegasi system".\n\nhttp://en.wikipedia.org/wiki/Solar_system
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Thirteen.\n\nOriginally it was thought there were the nine that were 'found' by Voyager 2 in 1986. Since then there's been more exploration and the discovery using the Hubble Telescope in December last year brought the current total to 13.  There's also incomplete rings called Ring Arcs
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The total number of known moons of Jupiter now stands at 63, currently the most of any planet in the solar system. Many additional tiny moons may exist that have not yet been discovered.
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Solar system  \n\nThe solar system comprises our Sun and the retinue of celestial objects gravitationally bound to it. Traditionally, this is said to consist of the Sun, nine planets and their 158 currently known moons; however, a large number of other objects, including asteroids, meteoroids, planetoids, comets, and interplanetary dust, orbit the Sun as well.
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The astrobiology folks at NASA have calculated that there are between one and thirty billion habitable planets in our Milky Way Galaxy.  If our solar system is typical,  you can multiply that by about 10 to get total planets: between 10 and 300 billion.  \n\nSo where is everybody?
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The LATEST (April, 2006) planets discovered in our GALAXY -\n(1)HD2246936 b\n(2)HD33283 b\n(3)HD86081 b\n\nSedna is the latest major object to be discovered in our solar system. It has NOT been officially designated as a planet yet, nor has its name been officially designated.
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There is only one solar system, and it is the one our planet is part of.\n\nThe solar system comprises the Earth's Sun and the retinue of celestial objects gravitationally bound to it. Traditionally, this is said to consist of the Sun, nine planets and their 158 currently known moons; however, a large number of other objects, including asteroids, meteoroids, planetoids, comets, and interplanetary dust, orbit the Sun as well. Astornomers are debating over the presence of a tenth planet.\n\nAlthough the term "solar system" is frequently applied to other star systems and the planetary systems which may comprise them, it should strictly refer to Earth's system specifically: the word "solar" is derived from the Sun's Latin name, Sol, and thus the term sometimes appears as Solar System. When talking about another stellar system or planetary system, including the stars and bodies associated with them through gravity, it is usual to shorten it to drop the term "stellar" and form names such as "the Alpha Centauri system" or "the 51 Pegasi system".
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Right now there are officially 9 planets. Depending on what we decide in the next year or so that number will change to 8, stay 9, go to 10, or even larger.  \n\nAn object larger than Pluto (2003 UB313) has been found, but we have not granted it official status as a planet. Don't expect this issue to be resolved any time soon, we've more or less "tabled" the issue until our general meeting in August, but there are a number of scientists in the IAU's Division of Planetary Sciences discussing this issue.\n\nRight now the newer astronomy textbooks generally have a section on "the planet controversy," and spend some time talking about all these newly discovered icy bodies.  They are all part of the Kuiper Belt, just like Pluto, and new books seem to be grabbing onto teaching about these objects much like the asteroids, addressing them as the left-overs of the formation of the solar system.  The Cosmic Perspective (a fairly decent intro astro textbook) for example has a chapter on "Remnants of Rock and Ice: Asteroids, Comets and Pluto"
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Our solar system is not the only solar system in the universe.  There are hundreds and thousands and millions of other planets in the universe, and many are just like ours, but we don't know about them because we have never been able to get anything further than pluto to get a good specific picture of stuff.  In a general picture, though, we do know there are other galaxies in the universe
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Currently, we have discovered 10 planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, and Sedna), but there are smaller planets called transneptunian objects that are very small and cannot be detected by current technology. Carla is probably a transneptunian object.
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Currently there are 182 known "exoplanets".  The large majority are Jupiter-sized or larger, and much closer to their Sun than the gas giants in our solar system are to our Sun.  Thus, the term "hot Jupiter" is used to describe these, big close exoplanets.\n\nWhile a variety of techniques exist to find exoplanets, the most common is looking for wobbles induced in the parent star by the planet's minor gravitational pull.  This technique means that we're biased towards finding planets which induce large wobbles in their parent star.  Large wobbles are produced by larger planets that are very close to their star...so the huge population of hot Jupiters we find is probably not representative of the true exoplanet distribution.
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With over sixty three moons to date and growing, Jupiter has more moons than any other planet in the Solar system*.  In fact, Jupiter and its moons are often referred to as the Jovian system (Jove being an alternate name for Jupiter), and are almost more complex as a planetary system than the Solar system itself is.\n\nThe planet with the second most numerous moons is the planet Saturn.  If you would like more information on either the moons of Jupiter or Saturn, I would highly recommend searching through either nasa.gov, nineplanets.org (which can be a little dry but still has a lot of useful information), or solarviews.com.\n\n\n*By the way, there's only one "Solar system" since the name refers to the star in the center of our star system, which is properly named "Sol", and not "the Sun"... all other systems containing a star and planets would be properly referred to as either a planetary system or a star system, as they do not orbit the star Sol.
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Not sure how you want this question answered, but here goes:\n\nThe solar system consists of the Sun, the 10 planets, the asteroid belt, The Kuiper belt, and the Oort cloud. The Sun is a main sequence G2 star that contains 99.86% of the system's known mass. Its two largest orbiting bodies, Jupiter and Saturn, account for more than 90% of the remainder; the Oort Cloud might hold a substantial percentage, but as yet its existence is unconfirmed.\n\nIn broad terms, the charted regions of the solar system consist of the Sun and its planetary system: the eight bodies in relatively unique orbits commonly called planets or major planets and two belts of smaller objects, which can be called minor planets, planetoids, meteoroids, or planetesimals. Pluto, the ninth planet, is also considered a member of the outer belt, and its status is currently uncertain, particularly since the discovery of 2003 UB313 (see below). Most objects in orbit round the Sun all lie within the same shallow plane, called the ecliptic plane, and orbit in the same direction. Many are in turn orbited by moons, and the largest are encircled by planetary rings of dust and other particles.\n\nThe major planets are, in order, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. Eight of the nine planets are named after or derived from gods and goddesses from Greco-Roman mythology.\n\nDistances within the solar system are measured most often in astronomical units, or AU. One AU is the mean distance between the Earth and the Sun, or 149 598 000 kilometres. Other units in common use include the gigametre (Gm, one million kilometres) and the terametre (Tm, one billion/milliard kilometres). Pluto is roughly 38 AU (5.9 Tm) from the Sun, while Jupiter lies at roughly 5.2 AU (778 Gm).\n\nUsing radiometric dating, scientists can estimate that the solar system is 4.6 billion years old. The oldest rocks on Earth are approximately 3.9 billion years old. Rocks this old are rare, as the Earth's surface is constantly being reshaped by erosion, vulcanism and plate tectonics. To estimate the age of the solar system scientists must use meteorites, which were formed during the early condensation of the solar nebula. The oldest meteorites (such as the Canyon Diablo meteorite) are found to have an age of 4.6 billion years, hence the solar system must be at least 4.6 billion years old.\n\nThe current theory of solar system formation is the nebular hypothesis, first proposed in 1755 by Immanuel Kant and independently formulated by Pierre-Simon Laplace. The nebular theory has been refined over many years and now has a great deal of evidence supporting it.\n\nTo briefly summarize, the nebular theory holds that the solar system was formed from the gravitational collapse of a gaseous cloud called the solar nebula. It had a diameter of 100 AU and was 2-3 times the mass of the Sun. Over time a disturbance (possibly a nearby supernova) squeezed the nebula, pushing matter inward until gravitational forces overcame the internal gas pressure and it began to collapse. As the nebula collapsed it began to spin faster to conserve angular momentum, and became warmer. As the competing forces associated with gravity, gas pressure, magnetic fields, and rotation acted on it the contracting nebula began to flatten into a spinning protoplanetary disk with a gradually contracting protostar at the center.\n\nGrains of dust (silicates and metals) and ice (hydrogen compounds) condensed from the gas, and began to accrete into larger and larger clumps, forming planetesimals. Inside the frost line, planetesimals were composed of rock and metal, because those are the only grains that can condense at those temperatures, and remained relatively small because they were only 0.6% the mass of the disk. The larger icy planetesimals beyond the frost line became massive enough to capture and hold onto helium and then hydrogen gases, which caused them to rapidly grow into jovian protoplanets.\n\nAft
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Ten. A new planet has been discovered that is approximately the same size as Pluto. It has not yet been formally named. Check http://www.nasa.gov/vision/universe/solarsystem/newplanet-072905-images.html for more info:)
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No one knows.\n\nScientists keep discovering large round things going around the sun (which is one definition of a planet).  Up until a few years ago, the pretty much accepted answer was 9:\n\n Mercury\n Venus\n Earth\n Mars\n Jupiter\n Saturn\n Uranus\n Neptune\n  and Pluto.\n\nBut in 2003 astronomers Mike Brown, Chad Trujillo, and David Rabinowitz discovered another planet-sized body, WAY out beyond Pluto.  The official name of this 'planet' for now is just 2003UB313, which is an astronomical code for keeping track of new objects.  The astronomers submitted the discovery to the International Astronomical Union (IAU).  The IAU will not only pick a name for this new body, but they will also determine if it will be officially called a planet.  \n\n Since UB313 is bigger than Pluto, there is actually a chance that, if the IAU decides UB313 is not a planet, then Pluto will not be called a planet either.  By discovering a new 'planet,' we may have decreased the number of planets in our solar system from 9 to 8!\n\n But that's not the end of the story.  Mike Brown and the gang keep discovering other big things out there that could possibly be called planets.  Their web site (see the link below) lists three other large objects they have found that might someday be called planets.\n\n And THAT's not the end of the story, either. That's just our solar system.  Scientists are discovering planets that go around other stars quite often.  The second web site below is NASA's place for information about these extrasolar planets. As of 15 June there were 193 of them!