largest planet in the universe?
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As of right now we don't know sizes of other planets outside our solar system.\n\n But, Jupiter is the largest planet in the Solar System. With an equatorial diameter of 143,884 km, (89,405 miles), it is as wide as more than 11 Earths stacked side by side. The planet also has the shortest period of rotation - Jupiter days last just under ten hours.
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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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As time goes on, we will be learning more and more about the planets that exist, and their size distribution. \n\nThe really large planets are probably gas giants, from what we can tell. The smaller planets are rocky planets, probably. We use two main methods of detecting extrasolar planets:\n\n1. Looking for wobbles caused by the extrasolar planet. \n\nIf the extrasolar planet is big enough and close enough to the star, then the star will be pulled sideways as it orbits the system barycenter, and we can detect that. This method is mainly useful for detecting gas giants, like Jupiter.  \n\n2. Looking for planetary transits\n\nBy looking for a pattern of repeating shadows caused by an extrasolar planet passing in front of a star, we can detect extrasolar planets. This transit method has not found as many planets yet as the wobble  method, but theoretically should be able to find much smaller planets, possibly even small rocky planets like earth.\n\nThere are several projects worldwide now (a couple of dozen or more) developing programs to find new extrasolar planets, so in the next few years there should be a large population of new planets found. So far, we know of about 150 extrasolar planets, most of which are gas giants. \n\nHowever, even if a lot of data are analyzed, from many many stars, using our best methods, our statistics will still be biased towards the largest planets, since those are the ones we can detect most easily. \n\nSome estimate that there might be planets around almost every star, and there could be several around every star, so there could be a LOT of planets in the universe. Very few will be in the habitable zone and of the right size for human habitation, but some probably will be.
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Seriously, this is funny. Anyhow, there is absolutely no way of knowing how many planets exist in the entire universe as the universe as we know it is far to huge for any of our technology to fully explore. \n\nAnyhow, please stick with the topic. This has absolutely NOTHING to do with computers.\n\nThanks!
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New planet, discovered by the Samuel Oschin Telescope at the Palomar Observatory near San Diego, Calif., on Jan. 8, 2005,  is yet to be formally named.\n\n(This  newly-discovered object is more distant than the mysterious planetoid SEDNA discovered in 2003. Sedna is designated 2003 VB12.)\n\n Is at least as big as Pluto and about three times farther away from the Sun than Pluto. It is very cold and dark.It is currently about 97 times farther from the sun than Earth, or 97 Astronomical Units (AU). For comparison, Pluto is 40 AU from the sun. \n\nThis places the new planet more or less in the Kuiper Belt, a dark realm beyond Neptune where thousands of small icy bodies orbit the sun. The planet appears to be typical of Kuiper Belt objects--only much bigger. Its sheer size in relation to the nine known planets means that it can only be classified as a planet itself
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Largest known to date is the "puffy planet" HAT-P-1b orbiting the sunlike star ADS 16402 B, one of a binary pair of G0 V stars 450 light yeard away, in the constellation Lacerta. Our sun is of spectral class G2 V i.e. a little cooler than ADS 16402 B.\n\nHAT-P-1b has a radius of 1.36 x the radius of Jupiter. \n\nIt was discovered on 13 September 2006 and is 450 light years away. It has the lowest density of any known extrasolar planet. It also has the name Krais.\n\nIt was announced as follows:\n\n"Using small automated telescopes in Arizona and Hawaii, the HATNet project has detected an object transiting one member of the double star system ADS 16402 AB. This system is a pair of G0 main-sequence stars with age about 3 billion years, at a distance of ~139 parsecs and projected separation of ~1550 AU. The transit signal has a period of 4.46529 days."\n\nNote: Only the radii of transiting planets are known.
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Jupiter is the largest planet in this solar system overall, but Earth is the biggest non-gas planet.
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The 10th planet was discovered last summer.\n\nJuly 29, 2005: "It's definitely bigger than Pluto." So says Dr. Mike Brown of the California Institute of Technology who announced today the discovery of a new planet in the outer solar system.\n\nThe planet, which hasn't been officially named yet, was found by Brown and colleagues using the Samuel Oschin Telescope at Palomar Observatory near San Diego. It is currently about 97 times farther from the sun than Earth, or 97 Astronomical Units (AU). For comparison, Pluto is 40 AU from the sun. \n\nThe planet's temporary name is 2003 UB313. A permanent name has been proposed by the discoverers to the International Astronomical Union, and they are awaiting the decision of this body before announcing the name.
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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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Possibly, as scientists have yet to make up their mind. One particular object, originally found in 2003 but confirmed two years later by Mike Brown (Caltech), David Rabinowitz (Yale University), and Chad Trujillo (Gemini Observatory), has renewed the old debate about what constitutes a planet since it is at least 5% larger than Pluto with an estimated diameter of 2400 km . It currently has no name, but has been given the provisional designation 2003 UB313, and has been nicknamed "Xena" by its discoverers, after the television character. It has many similarities with Pluto: its orbit is highly eccentric, with a perihelion of 38.2 AU (roughly Pluto's distance from the Sun) and an aphelion of 97.6 AU, and is steeply inclined to the ecliptic plane, at 44 degrees, more so than any known object in the solar system except the newly-discovered object 2004 XR190. Like Pluto, it is believed to consist mainly of rock and ice, and has a moon . Whether it and the largest Kuiper belt objects should be considered planets or whether instead Pluto should be reclassified as a minor planet has not yet been resolved.
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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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Xena, though the final verdict on whether it is the tenth planet is yet to come.\n\n2003 UB313 is a trans-Neptunian object (TNO) larger than the planet Pluto. It has been described as our solar system's tenth planet by its Mount Palomar-based discovery team, NASA, and some media outlets. The International Astronomical Union (IAU) is scheduled to publish the definition of the term "planet" in early September 2006, which will determine whether or not 2003 UB313 is classified as a planet. Its discoverer, Michael E. Brown, has given it the unofficial name "Xena".\n\n90377 Sedna is a trans-Neptunian object, discovered by Michael Brown (Caltech), Chad Trujillo (Gemini Observatory) and David Rabinowitz (Yale University) on November 14, 2003. At the time of its discovery it was the most distant observed natural solar system body, though this has now been exceeded by 2003 UB313. Sedna is described as a cold planetoid, perhaps as large as two-thirds the size of Pluto.\n\nA Planetoid is the term given to minor bodies orbiting the sun, that are bigger than meteoroids, but smaller than planets.
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Ask those living in other planets!
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I'll assume you meant "in the solar system"\n\n -  "pluto" isn't a planet! It's just a big block of dirty ice...\n\n -  The biggest planet is Jupiter, and is made of gas.\n\n -  The smallest would be mercury, which is right next to the sun.\n\n -  It would be hard to say which planet is "medem", since there are really big planets (the gas giants: Jupiter, Saturn, Uranus, and Neptune), and really small ones: (the inner planets: Mercury, Venus, the Earth and Moon, and Mars)
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Jupiter is the largest planet orbiting our Sun.
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Earth is the third planet from the Sun. It is the largest of the solar system's terrestrial planets, and the only planetary body that modern science confirms as harboring life. Scientific evidence indicates that the planet formed around 4.57 billion (4.57×109) years ago, and shortly thereafter (4.533 billion years ago) acquired its single natural satellite, the Moon.
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Jupiters the biggest in our solar system, but the universe is pretty effing big.  There are probably billions of planets in the universe.  Ask God.