What is the newest/youngest planet?
95960
I believe all the planets in our solar system formed about the same time, around 5 and a half billion years ago or so. I believe there is a younger solar system than ours around the star called Vega. It is in our galaxy and I believe it is around 26 light years away, the speed of light being 186,000 miles a second. The distance is the number of miles light would travel in 26 years, if that makes any sense. Vega is a blue star, a very young star. Our sun is a G star, a bit older. The stars are categorized O,B,A,F,G,K,M. The way to remember is the phrase "Oh, be a fine girl kiss me" with each letter corresponding to star categories. Vega is an O star, the youngest. I hope that isn't too complicated, I know your six.\n\nWhat you might do is get some colored balls to represent each of the star categories, some paint (in case the ball is the wrong color), and some cardboard, sticks, and glue. The M star is a red supergiant so a red dodge ball, the K is a red giant but not supergiant, so a red delicious apple, the O is blue-white, the G is golden, yellow-orange like our sun. The B, A, and F stars I do not know much about.
330974
Here is another site.\n\nhttp://www.snyderweb.com/planets/
118436
The size wise order of the planets in our Solar system is as follows:-\n1) Jupiter, 2) Saturn,3) Uranus or Herschel,4) Neptune\n5) Earth, 6) Venus, 7)Mars,8)Mercury,9)Pluto.\nThe largest is Jupiter and the smallest is Pluto. Our moon is a natural satellite of the earth and not an independent planet. It is smaller than Pluto.
16804
It's the planet Venus.\nMore about it at http://science.nasa.gov/headlines/y2005/28nov_venusshadows.htm
483118
no there is no 10th planet.\n\nwell scientists argue that pluto is small and should not be called a planet.\n\nso when they discovered Sedna( the 10th planet), it was smaller than pluto and so was considered as a mini planet.
31095
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.
18186
Often many people get involved in discovering a "planet" as several observations are required to verify and calculate the orbit.  Exactly what a planet is is subject to debate as even Pluto is not completely accepted as one.  The debate includes the question "how big does a rock have to be for us to call it a planet as opposed to an asteroid?"  Planet X was one possibility that seemed to just fade out of the news.  "Buffy" is the nickname of the latest "unusual" object out there (see my source article).  Heheheh, yes, "Xena" came public a few days before "Buffy."  Both are among the many rocks in the Kuiper Belt, including Pluto.  NASA's launching a probe called "New Horizons" to check out Pluto and the Kuiper Belt.
756478
The 3 new dwarf planets are "Planet X", nicknamed Xena, but now given a new permanent name, Eris (the largest Trans-Neptunian Object, discovered 2003), and two former planets, 1 Ceres (the largest asteroid, discovered 1801) and Pluto (the largest Kuiper Belt Object, discovered 1930).\n\nBoth Ceres and Pluto were hailed as planets on discovery, then felt to be disappointingly small. then realised to be only the first of many such objects in their region of the Solar System. then realised to have nothing especially remarkable about them as compared to other such objects, then getting discovered which might equally lay claim to be planets, if they remained as planets, and then were eventually downgraded and no longer regarded as planets: a process of gradual disillusionment, if you like.\n\nCeres has no moons, Eris has one (Dysnomia) and Pluto has three (Charon Nix and Hydra).\n\nIn Greek Mythology, Dysnomia (lawlessness) was the daughter of Eris (goddess of chaos), Pluto/Hades was the underworld and also the God of the underworld, Charon was the ferryman who took thesouls of the departed across the River Styx that led to the underworld, Hydra was the many-headed fabled monster that guarded the underworld, and Nyx was the Goddess of the Night.
150912
The newly discovered planet that rotates our sun is called 2003 UB313, but this question is causing a stir because since theres so many objects that are the size of pluto that rotate our sun scientists are trying to define what the term "planet" exactly means.\nfor more information look at the website below from "NASA"
104242
Yes! The 10th planet was discovered in 2005, and is temporarily known as 2003 UB313.  However, 2003 UB313 is located in the Kuiper belt, which is made up of numerous objects, and there may be many more that could be counted as planets.  The definition of "planet" is currently a topic of debate, and some argue that neither 2003 UB313 nor Pluto should be considered planets.  I believe that the popular media has sometimes refered to it as "planet x," but this is not its official name.
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!
745
There are actually several "planet like" objects beyond Pluto in an area called the Kuiper belt that contains thousands of objects that circle the sun.\n\nAt present none of them have been officially recognized as new planets. \nThe discovery of these new planet size objects including  2003 UB313 (nicknamed XENA), Sedna(in 2004) and Quaoar(in 2002 by the same team) have triggered a re-evaluation of the necessary criteria to call something a planet.\n\nIt is likely that this team at Caltech will  discover other objects to be added to the list of potential "planets" in our solar system.\n\n2003 UB313(nicknamed XENA unofficially) is larger than Pluto which leaves officials in a bit of dilemna.  How can they recognize Pluto as a planet and not this object?
30331
According to the authority of the IAU, there are nine planets in our solar system. In increasing distance from the Sun they are (with the astronomical symbol in brackets):\n\nMercury (☿) \nVenus (♀) \nEarth (♁) with one confirmed natural satellite, Luna (the Moon) \nMars (♂) with two confirmed natural satellites, Phobos and Deimos \nJupiter (♃) with sixty-three confirmed natural satellites \nSaturn (♄) with forty-six confirmed natural satellites \nUranus () with twenty-seven confirmed natural satellites \nNeptune (♆) with thirteen confirmed natural satellites \nPluto (♇) with three confirmed natural satellites, Charon, S/2005 P 1 and S/2005 P 2 \nHowever, there is some pressure for Pluto to be reclassified as a Kuiper Belt object, especially in light of the discovery of 2003 UB313. This object, however, has not yet received a definitive classification from the IAU.\n\nSedna was widely touted as a planet when it was discovered in 2003, as it was the largest object found since Pluto. However, mainly due to its size still being smaller than Pluto's, it did not achieve planetary status from the IAU. However, the discovery in 2005 of 2003 UB313 (nicknamed Xena), with a size and mass larger than Pluto seems to have forced the issue. As of January 2006 it has not yet been accepted as a planet, but the IAU is expected to announce a definition of a planet soon, which will likely either see 2003 UB313 become a planet, or have Pluto stripped of its status.
167067
When I was in school, there was 9.  \n\nMercury\nVenus\nEarth\nMars\nJupiter\nSaturn\nUranus \nNeptune\nPluto\n\nNow, there has been another "planet" found.  I am not sure if they have classified it as a planet in our solar system just yet.
57853
Actually there is no tenth planet. Although Pluto is an official planet, others objects of about the same size, or even slightly larger won't be officially recognized as planets.\n\nAn object would need to be much larger, say the size of Neptune to become and official 10th planet. And some astronomers think that should an object may be out there.
122870
Go to the following website to get the latest news on the Pluto - Kuiper Belt mission:\n\nhttp://pluto.jhuapl.edu/
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.