Hmm, is there an 11th planet?
406851
In our Solar System?  Unlikely.  There are a bunch of things orbiting beyond Pluto that are bigger than it that could be considered planets if size were everything... although Pluto is just a large Comet that orbits on the inside of the Oort cloud.  \n\nIf there was anything beyond Neptune of any consequential size, chances are we would have detected it by now.
123864
there is no planet x.\nnot planet x,but an applo asteroid is going 2 hit the earth in 2019
84111
There are 9 named planets, and one new one that was recently discovered.
893622
there r three new planets other than the 9 \n-ceres\n-charon\n-2003 UB313
327202
The last time I checked there were still 9 planets and they were considering maybe adding a 10th. Pluto is a planet with a moon of it's own named Charon. Astronomers have also identified a couple of other large bodies orbiting beyond Pluto. It has been suggested that there could be two planetoids beyond Pluto that revolve around each other.
35874
In our Solar System, there are eight official planets, nine if you count Pluto (whose status is being debated).  \n\nAs for the rest of the universe, it is difficult to say, but it is reasonable to assume that planet formation from leftover stellar material is relatively common.  Astronomers usually detect large gaseous planets (like Jupiter) by the slight wobble of the star's motion due to the gravity of the planet, so currently it is almost impossible to detect small planets.\n\nAs of November 2005, there were 164 confirmed extrasolar planets.
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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!
1133073
I don't know about the other 8 planets of our system because no life has been found yet but there are other galaxies and it seems arrogant to believe we are the only ones made with so many possible environments for others.
98664
There have been no planets added to the current list of nine in our solar system.  There have been several planets found around a number of nearby stars but those are not associated with our solar system.  To get a list of those go to exoplanets.org.\n\nThere have been a number of recent discoveries of object near or at the edge of our solar system.  These can have any number of names such as trans-Neptunian object, Kuiper Belt object, inner Oort cloud member, among others.  These are not planets.  They simply do not fit the criteria necessary to be called a planet but more importantly they have not been designated that title by the official naming authority for professional astronomy, the IAU.  \n\nThese objects resemble Pluto in some aspects but we actually know very little about them because they are so distant and small.  Among the more notable of these discoveries are Sedna, Xena and Quaoar.  They are small icy, rocky bodies that are believed to have changed very little since they formation 4.5 billion years ago whenthe solar system formed.
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HOW MANY ARE KNOWN AT THE MOMENT?:\n\n8 in our solar system + 3 dwarf planets\n\n(Planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus & Neptune) (Dwarf Planets: 1 Ceres, 134340 Pluto, 136199 Eris)\n\nAND IN THE MILKY WAY GALAXY?\n\nSince pulsar planets were discovered in 1992 and 51 Pegasi b was discovered in 1995 we now know a total of 209 orbiting other stars:\n\nDetected by radial velocity method: 169 planetary systems, 197 planets, 20 multiple planet systems. \n\nDetected by microlensing: 4 planets. \n\nDetected by direct imaging: 4 planets. \n\nPulsar planets: 2 planetary systems, 4 planets, 1 multiple planet system. \n\nSee the full list in the Encyclopaedia of Exoplanets (third link) published and maintained by the Paris Observatory. Appropriately as it was the work of Urbain LeVerrier at that observatory that led to the discovery of Neptune in 1846.\n\nWHAT OF THE FUTURE?\n\nImproved detection rates can be expected in the coming years. Principally from CoRoT and the Kepler Mission: which being space-based will avoid the problems the earth's atmosphere creates for ground-based telescopes,\n\nCOROT:\n\nOn 15th November 2006 the CoRoT spacecraft arrived at the Baikonour launch base,\n\nCOROT (COnvection ROtation and planetary Transits) is a space mission approved and led by the French Space Agency (CNES) in conjunction with the European Space Agency and other international partners. The primary objective of COROT will be to search for extrasolar planets, particularly those of large terrestrial size. It is scheduled for launch on December 22, 2006, and will be the first mission of its kind.\n\nCOROT consists of a 27 cm in diameter afocal telescope with an array of spectroscopic detectors. The satellite has a launch mass of 630 kg, is 4.10 metres long, 1.984 metres in diameter and powered by two solar panels. \n\nA Russian rocket will lift the satellite into a circular polar orbit with an altitude of 827 km. Over its planned 2½ years mission it will observe perpendicular to its orbital plane meaning there will be no Earth occultations, allowing 150 days of continuous observing. During the northern Summer it will observe in an area around Serpens Cauda and during the Winter it will observe in Monoceros. Between this observing periods for 30 days, COROT will observe 5 other patches of the sky.\n\nThe probe will monitor the brightness of stars, watching for the slight dimming that happens in regular intervals when planets transit their primary. COROT will be sensitive enough to detect rocky planets, though only those several times larger than Earth; it is also expected to discover new gas giants, which comprise almost all of the known extrasolar planets.\n\nCOROT will also undertake asteroseismology. It can detect luminosity variations associated with acoustic pulsations of stars. This phenomenon allows calculation of a star's precise mass, age and chemical composition and will aid in comparisons between the sun and other stars.\n\nIn each field of view there will be one main target star for the asteroseismology as well as up to nine other targets. Simultaneously, it will be recording the brightness of 12,000 stars brighter than apparent magnitude 15.5 for the extrasolar planet study. It is expected that a few dozen planets will be found.\n\nTHE KEPLER MISSION\n\nThe scientific objective of the Kepler Mission, due for launch in 2008, is to explore the structure and diversity of planetary systems. This is achieved by surveying a large sample of stars to achieve several goals:\n\nDetermine how many terrestrial and larger planets there are in or near the habitable zone of a wide variety of spectral types of stars \n\nDetermine the range of sizes and shapes of the orbits of these planets \n\nEstimate how many planets there are in multiple-star systems \n\nDetermine the range of orbit size, brightness, size, mass and density of short-period giant planets \n\nIdentify additional members of each discovered planetar
1183831
THere is an argument among astromoners as to whether classify the bodies beyond pluto as planets... consider that in the asteroid belt there are many objects orbiting the sun... do we call them all planets?\n\nCurrently there are officially only 9 planets:\nMercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.
77240
Our own solar system has 10 planets that we know of:\nMercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, and the newly discovered 2003 UB313.  That last one is still being contended, and why that debate gets so heated is beyond me.\n\nThere are actually 155 known extrasolar planets, and that number is only going to rapidly increase.  You can find a list on the California & Carnegie Planet Search site below:
570974
Are you talking about a real planet or Nibiru (aka Planet X)?  Note how I differentiate between the two.\n\nIf you're talking about a real planet (which I hope you are) it will probably depend on whether we end up changing how we define "planet" to accommodate new bodies that are being found beyond the orbit of Pluto.  If Pluto loses its planet status or new bodies are found, it would of course change which body is designated the "tenth planet."\n\nRegarding the 12th of December 2012, you'd probably be better off if you stopped paying so much attention to the Mayan calendar.  I doubt very much that anything of particular consequence is going to happen on that day, despite what New Agers are spouting nowadays.
118270
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.
973173
There are more stars than we can count.  Most of them have planets.   Most of those planets have moons.
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There are new planets being discovered all the time, but I assume you mean the new tenth planet in our solar system. \n\nThe discoverer has suggested the name Xena, after the television show. The official name is not due out for some time, and has to be decided by an international committee.
333414
Definitely. What are the odds that, among all the gazillions of planets and stars and galaxies, not ONE other life-form has developed? Hell, I don't even care if we can find sentiency, if there's just LIFE somewhere I'll be happy.