what about 10th planet and where is it?
612729
It is in an elliptical orbit past pluto. It is currently called Planet X because it has not been officially recognized as a planet, more study will be required to confirm if it is. Scientists lovingly call it "Xena" after the Warrior Princess show, and they believe it has a moon they call Gabrielle... Astronomers are such nerds.
746687
i don't know anything about this book or author.  it is bogus so forget it.\n\nthere is one star (sun), eight planets (mercury, venus, earth, mars, jupiter, uranus, and neptune), hundreds of dwarf, ball-shaped bodies ("1 ceres", "134340 pluto", and "136199 eris" for example), and tens of thousands small irregularly-shaped bodies in the solar system, and there is no hint of another star or any more planets.\n\nhttp://en.wikipedia.org/wiki/Extrasolar_planet\nhttp://exoplanet.eu/catalog.php\n\nin 2006,  astronomers found evidence for a planet orbiting a star 21,500 ± 3,300 away.  the star is cataloged as OGLE-2005-BGL-390L.  the planet, OGLE-2005-BGL-390Lb, is 5.5 earth masses, but astronomers have also found more than 200 others.
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:
31820
(Vulcan- no longer there, refer to first article), Mercury, Venus, Earth, Mars, (Minerva- another defunc planet now an asteroid belt), Jupiter, Saturn, Uranus, Neptune, Pluto and tenth planet.\n\nI believe the 10th planet(Planet X) is temporarily called Xena, and its moon(let) Gabrielle. I don't know when the Astronomy Body of Scientists responsible for naming the heavenly bodies will formally announce the name and nature of the planet as, up to now, they are even questioning if it is a planet or merely an overly large asteroid.
500795
Over 2 years ago, scientists DID find a 10th planet beyond Pluto, and it's even larger than Pluto. The planet is a typical member of the Kuiper belt, but its sheer size in relation to the nine known planets means that it can only be classified as a planet. Currently about 97 times further from the sun than the Earth, the planet is the farthest-known object in the solar system, and the third brightest of the Kuiper belt objects. \n\nFor images and info, check the NASA web site: http://www.nasa.gov/vision/universe/solarsystem/newplanet-072905.html
613765
See in\nhttp://www.seds.org/nineplanets/nineplanets/nineplanets.html\nGood luck!
1082359
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
70938
The newest one is Sedna. It's not a planet though.
783382
no the fourth planet from the sun.put me on best answer please!\n\nHappy Trails ♥!
376133
Never heard about it. There are many places in the web \n\nhttp://astronomylinks.com/solar_system/planets/\nhttp://www.absoluteastronomy.com/\nhttp://curious.astro.cornell.edu/planets.php
1054611
It depends on the exact definition of a planet. 2003 UB313 is a an object that is out past Pluto, AND it is bigger than Pluto (and yes 2003 UB313 orbits the Sun).\n\nIn September, the IAU will give the exact definition of a planet. At this time, our solar system could officially have more planets, or it could have less. \n\nSome people don't think Pluto should be classified as a planet, and many say that if Pluto was discovered today, it wouldn't be classified as a planet. But if Pluto remains a planet, it is likely 2003 UB313 will become our tenth planet.
1071483
No, NOT Sedna!  (This is how bad information just multiplies.)\n\nSedna is smaller than Pluto, and unlikely to be classified a planet.  If anything will be classified as our 10th planet it is 2003 UB313, which is larger than Pluto.\n\nBut until then, we only have 9 official planets.
4466
Pioneer 10 never reached Pluto.  In fact, no probe ever has.  There is, however, a new space probe called New Horizons that will go to Pluto, and beyond.
120883
The newest planet was catalogued as 2003UB313 by NASA.\n\nThe new planet, which is yet to be formally named, is at least as big as Pluto and about three times farther away from the Sun than Pluto. It is very cold and dark. The planet was discovered by the Samuel Oschin Telescope at the Palomar Observatory near San Diego, Calif., on Jan. 8, 2005.
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.
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.
11810
The 10th planet.\nhttp://science.nasa.gov/headlines/y2005/29jul_planetx.htm