is there really a tenth planet behind pluto called sedna?
352109
Actually, the people who found it honestly want to have it called Xena.\n\nOn July 29, 2005, a Trans-Neptunian object called 2003 UB313 was announced, which on the basis of its magnitude and simple albedo considerations is assumed to be larger than Pluto. This caused its discoverers to call it the "10th planet" of the solar system, although there is no consensus yet on whether to call it a planet, and others consider the new discovery to be the strongest argument yet for demoting Pluto to the status of a minor planet.\n\nBut until then, it's being refered to as Planet X.
1107840
Because there are still arguments whether Pluto is actually a planet, "Sedna" is larger than Pluto. But I believe the argument stems from sheer distance from the Sun, it is more of a rogue body.
730339
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.
86735
Well... Pluto isn't exactly a planet... some people speculate it is... others don't. Yes, another one has been discovered a while ago... I think it was Planet Nebula or something... in the far away galaxy of Cygnus (the constellation that resembles a goose)... You are talking about our solar system... right? I thought as much. In our solar system... there'd be 8 or 9, depending if you call Pluto a planet or not.\n\nEDIT: OK... there was one mass that could be considered a planet found in our solar system. It was called Ceres or something... found between Mars and Jupiter. Pluto may be an asteroid!
103745
It's temporary name is 2003 UB313.  It will not be called "pluto 2000," because it will be named by astronomers rather than 12-year-old boys.  It will most likely be named for a Roman diety like the other planets were.  And it is not the same distance from the sun as Pluto is (nor is it equidistant from the two bodies as your wording suggests), but is actually over twice as far from the Sun as Pluto is.  Pluto is about 40AU from the sun (although this distance varies significantly due to Pluto's highly eliptical orbit), whereas 2003 UB313 is about 97AU from the sun.
999169
I'm guessing you mean Sedna.  It is not classified as a planet.\n\nHere's a page on it: http://en.wikipedia.org/wiki/90377_Sedna
57670
According to Wikipedia, the official designation of this "planet" is 2003 UB313.  Its discoverers claim that it is definitely larger than Pluto, and that it has at least one moon.\n\nThe name is not actually Xena, and this is simply a codename used by the discoverers, and has not been submitted to the International Astronomical Union for consideration as a real name for the planet.\n\nIt's roughly 20 percent larger than Pluto, I guess.  They can't disclose the name that they will be proposing for the planet.\n\nThere is a re-definition of the term "planet" going on right now by the IAU, so it is possible that this will turn out not to be considered an actual planet.\n\nMore info here: http://en.wikipedia.org/wiki/2003_UB313
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.
692923
In the first place, we're not entirely sure we've discovered the whole solar system. We just discovered a new planet further out than Pluto. Its name is Sedna, and now we think there may be another planet in our solar system even further out than Sedna. \n     In the second place, it is possible but unlikely that life, intelligent or otherwise, exists on any body in our solar system besides Earth, but scientists think that Europa probably has the greatest chance of supporting life of any body in our solar system besides Earth. That does not mean it is very probably that Europa has life--many scientists think that the probability of that is low. But it is still the most probable.
554555
Discovery of the 10th planet!  Recent discovery.  Not much info. yet so no one can say if you are wrong on any point!
596644
The most recent planet discovered in our our solar system is named Cedna after the Inuit goddess of the sea. It is even smaller than Pluto.
642319
Wll the 10th planet is sedna.It has a vast amt. of ice on it.\nThe first detection of the long-hypothesized Oort cloud came in March 2004 when astronomers reported the discovery of a planetoid about 1,700 km (about 1,000 mi) in diameter.Pluto is about 2,360 km (1,475 mi) in diameter.\n\nThey named it Sedna, after a sea goddess in Inuit mythology in Greek Language.\nSedna was found about 13 billion km (about 8 billion mi) from the Sun. \n\nAt its farthest point from the Sun, Sedna is the most distant object in the solar system and is about 130 billion km (about 84 billion mi) from the Sun.
136781
Pluto (planet), ninth planet from the Sun and outermost known member of the solar system. Pluto was discovered as the result of a telescopic search inaugurated in 1905 by the American astronomer Percival Lowell, who conjectured the existence of a distant planet beyond Neptune as the cause of slight perturbations (see Orbit) in the motions of Uranus. Continued by members of the Lowell Observatory staff, the search ended successfully in 1930, when the American astronomer Clyde William Tombaugh found Pluto near the position Lowell had predicted. The new planet’s mass, however, seemed insufficient to account for the perturbations of Neptune, and the search for a possible tenth planet continues.\n\nPluto revolves about the Sun once in 247.7 years at an average distance of 5.9 billion km (3.67 billion mi). The orbit is so eccentric that at certain points along its path Pluto is closer to the Sun than is Neptune. No possibility of collision exists, however, because Pluto’s orbit is inclined by more than 17.2° to the plane of the ecliptic and never actually crosses Neptune’s path.\n\nVisible only through large telescopes, Pluto is seen to have a yellowish colour. For many years very little was known about the planet, but in 1978 astronomers discovered a relatively large moon orbiting Pluto at a distance of only about 19,000 km (12,000 mi) and named it Charon. The orbits of Pluto and Charon caused them to pass repeatedly in front of one another from 1985 to 1990, enabling astronomers to determine their sizes fairly accurately. Pluto is 2,284 km (1,420 mi) in diameter, and Charon is 1,192 km (740 mi) in diameter, making them even more like a double-planet system than are the Earth and its moon. Pluto was also found to have a thin atmosphere, probably of methane, exerting a pressure on the planet’s surface that is about 100,000 times weaker than the Earth’s atmospheric pressure at sea level. The atmosphere appears to condense and form polar caps during Pluto’s long winter. The first map of Pluto’s surface was made by the Hubble Space Telescope. It shows vague light and dark regions of unknown origin.\n\nWith a density about twice that of water, Pluto is apparently made of much rockier material than are the other planets of the outer solar system. This may be the result of the kind of cold-temperature/low-pressure chemical combinations that took place during the formation of the planet. Some astronomers have suggested that Pluto may be a former satellite of Neptune, knocked into a separate orbit during the early days of the solar system. Charon would then be an accumulation of the lighter materials resulting from the collision.
435627
many 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, and 2003 UB313.  this is also called the kuiper belt.  pluto was the first kuiper belt object discovered.
11587
10 planets!!!These idiots don't even know what it is called!!!it's called "Sedna"
486363
NO, WHEN PLUTO WAS FORMED IT WAS STRAIGH AWAY GIVEN NAME PLUTO WAS DISCOVERED BY  Clyde W. Tombaugh \nDiscovered on February 18, 1930 \nABT THE MISTRY OF PLANET-X THEN ITS THE PLANET SOMEWHERE FAR FROM PLUTO.
684614
Pluto, BUT, there was a new planetOID (a combination of a planet and asteroid) discovered and it was named "Sedna".