is there any planet discovered outside the solar system?
353329
There are many planets discovered (through pictures of many forms). There haven't been any planets discovered with life on them, but there have been many planets discovered.
604795
If you are talking about space aliens or aliens from another planet, there are not any.\nNo aliens have been found that are extraterrestrial.\n\nIf you just want a story, click links below.
1171177
We have already found planets orbiting other stars in our solar system. They detect them by the "wobble" of the star. The wobble tells them something is orbiting the star. Knowing the stars aproximate mass, they can tell roughly how big the planet is. We have found almost one hundred planets outside of our solar system.
336486
No.  \nHere is why: Although the list of known extra-solar planets is growing, to my knowledge, none have been described where there are two in the same orbit.  In terms of solar planets (ie us) although it is true that two planets in our solar system cross orbits, this is not 'sharing' the same orbit (at least in the sense of your question I think).  It seems possible enough, but has not yet been described.
1174488
No one knows.\n\nScientists keep discovering large round things going around the sun (which is one definition of a planet).  Up until a few years ago, the pretty much accepted answer was 9:\n\n Mercury\n Venus\n Earth\n Mars\n Jupiter\n Saturn\n Uranus\n Neptune\n  and Pluto.\n\nBut in 2003 astronomers Mike Brown, Chad Trujillo, and David Rabinowitz discovered another planet-sized body, WAY out beyond Pluto.  The official name of this 'planet' for now is just 2003UB313, which is an astronomical code for keeping track of new objects.  The astronomers submitted the discovery to the International Astronomical Union (IAU).  The IAU will not only pick a name for this new body, but they will also determine if it will be officially called a planet.  \n\n Since UB313 is bigger than Pluto, there is actually a chance that, if the IAU decides UB313 is not a planet, then Pluto will not be called a planet either.  By discovering a new 'planet,' we may have decreased the number of planets in our solar system from 9 to 8!\n\n But that's not the end of the story.  Mike Brown and the gang keep discovering other big things out there that could possibly be called planets.  Their web site (see the link below) lists three other large objects they have found that might someday be called planets.\n\n And THAT's not the end of the story, either. That's just our solar system.  Scientists are discovering planets that go around other stars quite often.  The second web site below is NASA's place for information about these extrasolar planets. As of 15 June there were 193 of them!
53486
Well, there's nine so far - Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.  However, scientists have discovered other planets that orbit our Sun that are even further out than Pluto!  So there's a possibility that we may update our information involving the solar system sometime in the future....
217130
Nah, there's nothing out there. It would take too long to travel to any of the planets. By the time I got to Jupiter I would be wearing diapers and being fed Geritol through an IV everyday.
406851
In our Solar System?  Unlikely.  There are a bunch of things orbiting beyond Pluto that are bigger than it that could be considered planets if size were everything... although Pluto is just a large Comet that orbits on the inside of the Oort cloud.  \n\nIf there was anything beyond Neptune of any consequential size, chances are we would have detected it by now.
160820
most probably.. life of other planets is probably totally different from that of our planet.. but it definatly exists
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?
51464
Yes, the general consensus appears to be that another planet has been found, which is currently designated 2003 UB313, it is about 2,800km across - a world of rock and ice and somewhat larger than Pluto. Scientists say it is three times as far away as Pluto, in an orbit at an angle to the orbits of the main planets. \n\nThough it should also be understood that the scientific community are also considering a redefinition of planet, which might reclassify not only this new 10th planet and Pluto has not being planets.
70556
Planet is a difficult word to use to describe objects in the outer solar system.  They are typically called trans-Neptunian objects, Kuiper Belt objects, or inner Oort cloud objects since they are very much unlike the four inner and four Jovian planets.  \n\nHowever that said an object by the name of Xena was found recently.  Based upon its distance and reflected light astronomers believe it is larger than Pluto.  Its orbit puts it near the same distance as Pluto's orbit...slightly further.  Also Sedna was discovered also recently.  Called an inner Oort cloud member it is slighly smaller than Pluto and it appears to have peculiar properties like being overly red in color.\n\nAnd of course there are roughly 150 extra-solar planets discovered around other stars.
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.
483328
the planet?Pluto is the farthest planet from the Sun (usually) and by far the smallest. Pluto is smaller than seven of the solar system's moons (the Moon, Io, Europa, Ganymede, Callisto, Titan and Triton). \n\n        orbit:    5,913,520,000 km (39.5 AU) from the Sun (average)\n        diameter: 2274 km\n        mass:     1.27e22 kg\nIn Roman mythology, Pluto (Greek: Hades) is the god of the underworld. The planet received this name (after many other suggestions) perhaps because it's so far from the Sun that it is in perpetual darkness and perhaps because "PL" are the initials of Percival Lowell. \nPluto was discovered in 1930 by a fortunate accident. Calculations which later turned out to be in error had predicted a planet beyond Neptune, based on the motions of Uranus and Neptune. Not knowing of the error, Clyde W. Tombaugh at Lowell Observatory in Arizona did a very careful sky survey which turned up Pluto anyway. \nAfter the discovery of Pluto, it was quickly determined that Pluto was too small to account for the discrepancies in the orbits of the other planets. The search for Planet X continued but nothing was found. Nor is it likely that it ever will be: the discrepancies vanish if the mass of Neptune determined from the Voyager 2 encounter with Neptune is used. There is no Planet X. But that doesn't mean there aren't other objects out there, only that there isn't a relatively large and close one like Planet X was assumed to be. In fact, we now know that there are a very large number of smaller objects in the Kuiper Belt beyond the orbit of Neptune. \nPluto is the only planet that has not been visited by a spacecraft. Even the Hubble Space Telescope can resolve only the largest features on its surface (left and above). A spacecraft called New Horizons was launched in January 2006. If all goes well it should reach Pluto in 2015. \nFortunately, Pluto has a satellite, Charon. By good fortune, Charon was discovered (in 1978) just before its orbital plane moved edge-on toward the inner solar system. It was therefore possible to observe many transits of Pluto over Charon and vice versa. By carefully calculating which portions of which body would be covered at what times, and watching brightness curves, astronomers were able to construct a rough map of light and dark areas on both bodies. \nIn late 2005, a team using the Hubble Space Telescope discovered two additional tiny moons orbiting Pluto. Provisionally designated S/2005 P1 and S/2005 P2, they will be assigned real names when the discovery is confirmed. They are estimated to be between 60 and 200 kilometers in diameter. \nPluto's radius is not well known. JPL's value of 1137 is given with an error of +/-8, almost one percent. \nThough the sum of the masses of Pluto and Charon is known pretty well (it can be determined from careful measurements of the period and radius of Charon's orbit and basic physics) the individual masses of Pluto and Charon are difficult to determine because that requires determining their mutual motions around the center of mass of the system which requires much finer measurements -- they're so small and far away that even HST has difficulty. The ratio of their masses is probably somewhere between 0.084 and 0.157; more observations are underway but we won't get really accurate data until a spacecraft is sent. \nPluto is the second most contrasty body in the Solar System (after Iapetus). \nThere are some who think Pluto would be better classified as a large asteroid or comet rather than as a planet. Some consider it to be one of the larger Kuiper Belt objects (also known as Trans-Neptunian Objects). There is considerable merit to the latter position, but historically Pluto has been classified as a planet and it is very likely to remain so. Further complicating the situation, one such object (2003UB313) was recently discovered that is almost certainly larger than Pluto. Should it, too, be classified as
8871
Strictly speaking, Sedna is not in our Solar system but in the surrounding Van Oort cloud. It is quite probable that other planet-sized objects may be found in the Van Oort cloud which might move on an irregular orbit around our sun.
365063
As of April 18th, 2006 we know of 152 planetary systems other than our own containing a total of 176 planets.  This number grows fairly frequently as more and more observations are being made.
530261
There are 6 planets that even the ancients knew about.  From the sun outward, they are Mercury, Venus, Earth, Mars, Jupiter, and Saturn.  (of  course, the ancients did not know that Earth was quite a bit like those little points of light that moved through the heavens).  William Herschel discovered Uranus in 1781. Neptune was discovered on September 23, 1846 by Johann Gottfried Galle. And Clyde Tombaugh discovered Pluto on February 18th, 1930.\n\nA few other discoveries may turn out to be planets.  In 2003 Mike Brown and two other astronomers discovered an object larger than Pluto, temporarily named 2003 UB313.  The International Astronomical Union will make a determination whether UB313 will be called a planet, and they'll also give it a proper name from mythology.  \n\nAnd astronomers have found other planet-sized bodies circling distant stars. As of May 18th, 193 of these "extra-solar" (meaning away from our sun) planets have been discovered.  See the exoplanet link below for more info.\n\nSo, to sum things up, from the sun outward, your list is:\n\nMercury\nVenus\nEarth\nMars\nJupiter\nSaturn\nUranus\nNeptune\nPluto\nUB 313 (maybe)\n\nand 193 planets somewhere else in our Milky Way galaxy.