what is the name of the new planet NASA discoverd?
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.
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.
195029
Yes, and 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.
139598
Don't forget the tenth planet "Xena"\n\nSome info on the planets:\n\nhttp://beaker.atspace.org/spaceglossplanets.htm
11596
venus?\n\nhttp://www.answers.com/main/ntquery?method=4&dsid=2222&dekey=Venus+%28planet%29&gwp=8&curtab=2222_1
189597
My favorite planet is the 10th planet, 2003 UB313, discovered to be larger than Pluto last year, and is also known as "Xena". (If you think im full of it read up on it yourself)
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.
156326
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.
572044
Yes UB313 (which was not discovered last year, but in 2003).\n\nBe careful calling it a planet, however.  Web sites and journalists love to talk about the "tenth planet" because it sounds more exciting that "yet another trans-neptunian object (TNO)."  However, astronomers (the International Astronomical Union, or IAU) do not officially recognize this as a "planet."  This may change later this year (in September) when the IAU is scheduled to come up with a more solid definition of what a "planet" is (how big, what orbit, etc.) ... but until then, you sound more like a real astronomer if you don't call it a "planet."
1111150
I thought it was Xena, but:\nThe planet, with the current temporary (and unfortunate) name 2003UB313, was discovered in an ongoing survey at Palomar Observatory's Samuel Oschin telescope by astronomers Mike Brown (Caltech), Chad Trujillo (Gemini Observatory), and David Rabinowitz (Yale University). \n\nAbout the name: The real name of the new planet is currently in limbo while committees decide its fate. For those speculating that the name will be "Lila" based on the web site name I must warn you that that is really just a sentimental dad's early-morning-after-no-sleep naming of a web site for his (at the time) three week old daughter and one should not take it too seriously! In fact, the sentimental dad was so tired he even spelled his own daughter's name wrong (it is "Lilah"). The name  "Xena" is frequently heard associated with this planet; this name comes from an  internal cod name that we used before we publically announced the existence of the planet. Other code names have been "Santa" (2003 EL61), "Rudolph" (the moon of 2003 EL61), "Easterbunny" (2005 FY9) and "Flying Dutchman" (Sedna), and "Gabrielle" (the moon of 2003 UB313). We use these names internally simply because they are easier to say and remember than things like 2003 EL61 or S/2005 (2003 UB313) 1 . There is no chance whatsoever that these will become the permanent names of these objects! As soon as the committees make their decisions these objects will  get real names. When we first announced the existence of these objects we thought that the real names would be decided in days to weeks, not months to years so it never occured to us that these code names would last more than a few days. We hope the committees decide soon  so people can start getting used to the real more dignified names soon!
999671
The Name is Sedna (the 10th planet)
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
604663
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).
573216
astronomers are trying to define the word planet, but it isn't easy.  many astronomers 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 known ice dwarfs, including pluto, quaoar, sedna, 2003 EL61, and 2003 UB313 (the official name of xena).  this is also called the kuiper belt.  pluto was the first kuiper belt object discovered.  2003 UB313 is about five percent bigger than pluto.\n\nhttp://en.wikipedia.org/wiki/Kuiper_belt
272536
yes--look:\nhttp://www.nasa.gov/audience/forstudents/k-4/home/F_Planet_Seasons.html
487505
It's actually just a large asteroid, and they haven't decided whether to call it a planet yet. Problem is, they also discovered that Pluto is just a large asteroid, and if they disacknowledge the new planet, they would have to also disacknowledge Pluto.
490426
In 2003, Mike Brown of Caltech and other scientists (Trujillo and Rabinowitz) discovered another planet-sized body, larger than Pluto, far out beyond Pluto.  Following the convention for temporary names of newly discovered astronomical bodies, it was temporarily named 2003 UB313.  The astronomers who discovered it also used a 'code name' - Xena - among themselves.  But the official name will be decided the the International Astronomical Union, the organization that has the last word on such things.  \n\nXena is a pretty cool name, but there is no chance that it will be the final name.  There are no rules for naming astronomical objects, but since all the others are named for Greek and Roman gods, there's a good chance that this one will have a name from mythology, too.  The bad news is that all the good names have been taken (by planets, moons, asteroids, and other big rocks out there).  \n\nAnd some other potential bad news is that not only is the IAU going to name this thing, but it's going to decide if it even should be called a planet.  Since UB313 is bigger than Pluto, there's a chance that Pluto may also be downgraded - we may end up not with 10 plantets, but only 8 - going backwards!\n\nThe second web site, below, gives lots of great info about UB313, direct from the horses mouth, Mike Brown himself.  It's a well-written web site, written (mostly) in layman's language, and has lots of questions and answers about all kinds of things related to this discovery.  Check it out!