which is the latest planet we have found?
410746
(m)\n\nIn July 1995, two astronomers from the University of Geneva, Didier Queloz and Michael Mayor, found the first planet orbiting a normal star in the constellation of Pegasus by the spectroscopy method. The discovery of 51 Pegasus was confirmed by astronomers Geoff Marcy and Paul Butler of San Francisco State University. Marcy and Butler have since found numerous planets around other stars using the spectroscopy method. As of May 2000, we have found over 50 extrasolar planets. All of the planet-hunting methods tend to detect large planets -- about half the size of Jupiter to several times the size of Jupiter. These planets tend to orbit their parent stars within about 3 astronomical units (AU)\n\nSome of the extrasolar planets found.\nThe names of the planets are in the center of each row. The position of each planet in the row indicates its distance from its parent star in AU. The mass of the each planet is written to its right (MJ means "compared to the mass of Jupiter").
529349
In our galaxy it would be Pluto, but in other galaxies I'm sure its a planet that has never been discovered yet.\n\nEdited to add: No I meant galaxy - as in The Milky Way. I didn't mention the new 'planet' as it hasn't been approved as one yet.\n\nAnd ps next time get the name right! ;)
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."
827528
The info in the last answer is seven years old! The two planets it refers to brought the total of known extra solar planets to 17. It is now 210 and we are finding them at the rate of over 20 a year.\n\nThe Extra-solar Planets Encyclopedia maintained by the Paris Observatory reports two further planets WASP-1 and WASP-2 that have been found since the "puffy planet" HAT-1-Pb was announced on September 14th 2006.\n\nIt laconically states: 26 September:  WASP-1b and WASP-2b : two new transiting exoplanets detected with SuperWASP and SOPHIE (Collier Cameron et al.) \n\nThe Wikipedia link and CIT link reveal: \n\nSuperWASP is the Wide Angle Search for Planets program\n\nStar: WASP-1 \nConstellation: Andromeda\nRight ascension: 00h 20m 40s \nDeclination: +31° 59′ 24″ \nSpectral type: F7V \nDistance of star: 1000 light years\nMass of Star; 1.15 x Mass of Sun\nPlanet b Garafia-1 \nPlanet Type: Hot Jupiter\nPlanet mass: 0.89 x Mass of Jupiter\nOrbital period: 2.51997 Earth days\nSemi-major axis: 0.0382 AU\nOrbital Eccentricity: 0  \n\nStar: WASP-2 \nConstellation: Delphinus\nRight ascension: 20h 30m 54s \nDeclination: +06° 25′ 46″ \nSpectral type: K1V\nDistance of star: 500 light years\nApparent Magnitude of Star: 11.98\nMass of Star; 0.79 x Mass of Sun\nPlanet: b\nPlanet Type: Hot Jupiter\nPlanet mass: 0.88 x Mass of Jupiter\nOrbital period: 2.152226 Earth days\nSemimajor axis: 0.0307 AU\nOrbital eccentricity: 0\n\nInformation seems scant. This much I could glean, but you might like to do a Google search for WASP-1 and WASP-2 to see what you can discover.
893622
there r three new planets other than the 9 \n-ceres\n-charon\n-2003 UB313
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)
240127
There could be another planet ... but it will be so far away from the Sun that it may be even more difficult to find than Xena (the 10th planet).\n\nAs to the solar system existing in another planet?  Hmmm .... seriously mate ... no.  Not a chance.
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.
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!
307741
Right now there are officially 9.  Depending on what we decide in the next year or so that number will change to 8, stay 9, go to 10, or even larger.  An object larger than Pluto has been found, but we have not granted it official status as a planet.  Don't expect this issue to be resolved any time soon, we've more or less "tabled" the issue until our general meeting in August.
575467
UB313, the 10th "planet" that is said to be bigger than Pluto.\n\nI'm not lying, read all the sources.\nBTW, the CNN news which adds support to the discovered planet is dated February 2, 2006.
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.
584504
10 is my answer. A new planet call UB313 was discovered. Here are they planets in order:\nMecury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto.\n\n10 Planets said. 10 Points for the best answer
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.
47426
No. There have been a number of objects discovered recently in the outer solar system, including one which appears to be larger than Pluto. But unless something about the size of Neptune is found (which is possible) none of these are likely to gain official planet status.\n\nIn fact, in many respects Pluto should be "demoted," although that is not going to happen.\n\nThere isn't a real scientific definition of where the boundry is between a planet and, say, a moon, or a Kuiper object. For most objects it's clear what to call them, but for others the classification is ambigious. The reason being, of course, that our classifications are (somewhat) arbitrary and the solar system is composed of a continuum of objects of different sizes, in different orbits, etc.\n\nPluto was called a planet when it was discovered because a 9th planet was expected. Percival Lowell spent a long time looking for such a planet which he predicted from orbital irregularities he calculated with Neptune and Uranus. But he never found what he was looking for. Clyde Tombaugh, a couple of years later, resumed the search and eventually discovered Pluto. However, Pluto is much too small and in the wrong place to be Lowell's suspected planet. Lowell was probably just wrong in his calculations.\n\nBecause a 9th planet was expected and because in 1930 little could be told of Pluto's physical characteristics, I don't think anyone seriously doubted whether or not it should be classified as a planet. It seemed obvious, at the time, that it was.\n\nIn the 1950s and 1960s astronmers began to postulate that comets orginated from a vast pool of objects in the extreme distant regions of the solar system. This lead to the hypothesis of the Oort cloud, and the "closer" Kuiper belt (that being 50 - 100 AU from the Sun).\n\nIt wasn't until the 1990s that a lot of Kuiper-esque objects were actually discovered. (I hedge on the classification, because some objects similar in diamter, etc., have been found inside the orbit of Pluto.)\n\nIf in 1930 Clyde Tombaugh had an inkling of something like a Kuiper belt he probably would not have assumed that Pluto was a planet. If Pluto was discovered today it also would (probably) not be considered a planet.\n\nSo basically, if we could re-do history Pluto would be "demoted." On the other hand, there have been generations of kids who learned the whole 9 planets bit. Because of the the International Astronomical Union - the international organization in charge of naming things - has *officially* declared Pluto a planet. A link to their announcement is below.\n\nI suspect - and I am taking an educated guess - that the new objects in the outer solar system, even though slighly larger than Pluto - won't get "official" planet status.\n\nOf course the reality is more complex, and nature doesn't always fit neatly into human classification schemes.
753879
Astronomers say they have discovered what appears to be an entirely new kind of planet, an extra-large gas giant unlike any known world in our solar system or beyond. \n\n"This questions our understanding of how giant planets are formed and evolve," said Robert Noyes, a senior physicist at the Harvard-Smithsonian Center for Astrophysics (CfA). \n\n\nThe planet, dubbed HAT-P-1, is located some 450 light-years from Earth in the constellation Lacerta. \n\nIt is the largest planet ever discovered and boasts a radius nearly 1.4 times larger than Jupiter's. \n\nHAT-P-1 is also the least dense of all known planets. \n\n"This planet is about one quarter the density of water," said Gaspar Bakos, a Hubble fellow at CfA. \n\n"In other words, it's lighter than a giant ball of cork. Just like Saturn, it would float in a bathtub if you could find a tub big enough to hold it, but it would float almost three times higher." \n\nUnlike more familiar gas giants, including those in our solar system, HAT-P-1 does not appear to have a solid core.
375309
Right now there are officially 9 planets. Depending on what we decide in the next year or so that number will change to 8, stay 9, go to 10, or even larger.  \n\nAn object larger than Pluto (2003 UB313) has been found, but we have not granted it official status as a planet. Don't expect this issue to be resolved any time soon, we've more or less "tabled" the issue until our general meeting in August, but there are a number of scientists in the IAU's Division of Planetary Sciences discussing this issue.\n\nRight now the newer astronomy textbooks generally have a section on "the planet controversy," and spend some time talking about all these newly discovered icy bodies.  They are all part of the Kuiper Belt, just like Pluto, and new books seem to be grabbing onto teaching about these objects much like the asteroids, addressing them as the left-overs of the formation of the solar system.  The Cosmic Perspective (a fairly decent intro astro textbook) for example has a chapter on "Remnants of Rock and Ice: Asteroids, Comets and Pluto"