Is  there any info on a tenth planet in our solar system?
90524
I just picked this information up off a website... I found it using "Google"\nSEDNA: \nthe tenth planet in our solar system?\n\n \n Sedna, which was very recently discovered at the outer limits of our solar system, seems hardly any different from Pluto. It is a massive, spherical body that revolves around the Sun and may even have its own satellite. But does this really mean that Sedna is a planet?
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
1127691
First, forget Sedna.  That is a body smaller than Pluto, and it's not the one most likely to be our 10th planet. The one discovered last year, and which is larger than Pluto, is 2003 UB313, commonly known as Xena (although that is not among the names secretly submitted to the IAU as genuine candidates if the thing becomes a planet).\n\nAll the other planets (excluding Earth) are named after Roman gods, with the exception of Uranus, named after a Greek god.  I think we should go Greek again this time ... and it's about time we had another female besides Venus.\n\nSo I propose 'Nyx' (primoridal Greek goddess of the night, and daughter of Chaos).  The Roman equivalent is 'Nox' (which by the way is where we get 'equinox', meaning "equal-night" ... I learned that on West Wing.)\n\nAnd for the moon, one of Nyx's many children:  Hemera ("day"), Moros ("fate" or "doom"), or one of the three fates (Clotho, Atropos, or Lachesis), and there are many other candidates ... she had lots of children, a few of them with her brother Erebus.  (By the way, Erebus would be another good name (as a constant companion) ... but who knows if we'll discover another moon someday.
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?
186825
Yes there are nine in our solar system, and as someone else mentioned Pluto is not really meeting the requirements to be defined as a planet. But the problem is rewriting the history books which won't happen so they will leave it as a planet... a "historical planet".\n\nIf we are talking about all known planets we have discovered, there are many. Extra solar planets have been found around distant stars for several years now. Not actually seen but found by measuring that planets gravitational pull on it's star. Of course we can't get an accurate count of all planets in the universe but we can use the "Drake Equation" to get a good idea.\n\nThe Drake Equation is:\n\nN = N* fp ne fl fi fc fL\n\nN* represents the number of stars in the Milky Way Galaxy \nAnswer: Current estimates are 100 billion.\n \nfp is the fraction of stars that have planets around them \nAnswer: Current estimates range from 20% to 50%.\n\nForget about the rest of the equation because it doesn't apply (looking for intelligent life)\nKeep in mind this equation is for our galaxy. They estimate 100 billion Galaxy's in our Universe (not to mention other planets that exist in other dimensions that we have discovered as a result of trying to solve the "unified theory" of everything) so…\n\nYou do the math!!!
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
547157
*Pluto: officially the 9th planet in our solar system\n*10th planet: nothing officially has this designation.\n\nIf you are talking about 2003 UB313, then there is a comparison to be made.  They both live in a similar part of the solar system, but it looks like UB313 seems to be a bit redder than Pluto.  Pluto is also known to have a transient atmosphere, not measurements of a potential atmosphere of UB313 have yet been published.
11810
The 10th planet.\nhttp://science.nasa.gov/headlines/y2005/29jul_planetx.htm
141708
Yes. It's actually in our own solar system.  Whether it is a planet or not is the real question.  It is really small.  While bigger than pluto, it is still smaller than the Earth's moon!
746687
i don't know anything about this book or author.  it is bogus so forget it.\n\nthere is one star (sun), eight planets (mercury, venus, earth, mars, jupiter, uranus, and neptune), hundreds of dwarf, ball-shaped bodies ("1 ceres", "134340 pluto", and "136199 eris" for example), and tens of thousands small irregularly-shaped bodies in the solar system, and there is no hint of another star or any more planets.\n\nhttp://en.wikipedia.org/wiki/Extrasolar_planet\nhttp://exoplanet.eu/catalog.php\n\nin 2006,  astronomers found evidence for a planet orbiting a star 21,500 ± 3,300 away.  the star is cataloged as OGLE-2005-BGL-390L.  the planet, OGLE-2005-BGL-390Lb, is 5.5 earth masses, but astronomers have also found more than 200 others.
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.
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.
5355
No one knows.\n\nThere are about 10 planets in our solar system, depending on whom you ask.\n\nAround 100 planets have been detected in other solar systems.\n\nThere are at least 200 billion stars in the Milky Way Galaxy (ours).\n\nIf the average number of planets per star is 10, then there are 2000 billion or 2 trillion planets in our galaxy.\n\nNo one knows how many billion galaxies are in the Universe.
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.
843663
HOW MANY ARE KNOWN AT THE MOMENT?:\n\n8 in our solar system + 3 dwarf planets\n\n(Planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus & Neptune) (Dwarf Planets: 1 Ceres, 134340 Pluto, 136199 Eris)\n\nAND IN THE MILKY WAY GALAXY?\n\nSince pulsar planets were discovered in 1992 and 51 Pegasi b was discovered in 1995 we now know a total of 209 orbiting other stars:\n\nDetected by radial velocity method: 169 planetary systems, 197 planets, 20 multiple planet systems. \n\nDetected by microlensing: 4 planets. \n\nDetected by direct imaging: 4 planets. \n\nPulsar planets: 2 planetary systems, 4 planets, 1 multiple planet system. \n\nSee the full list in the Encyclopaedia of Exoplanets (third link) published and maintained by the Paris Observatory. Appropriately as it was the work of Urbain LeVerrier at that observatory that led to the discovery of Neptune in 1846.\n\nWHAT OF THE FUTURE?\n\nImproved detection rates can be expected in the coming years. Principally from CoRoT and the Kepler Mission: which being space-based will avoid the problems the earth's atmosphere creates for ground-based telescopes,\n\nCOROT:\n\nOn 15th November 2006 the CoRoT spacecraft arrived at the Baikonour launch base,\n\nCOROT (COnvection ROtation and planetary Transits) is a space mission approved and led by the French Space Agency (CNES) in conjunction with the European Space Agency and other international partners. The primary objective of COROT will be to search for extrasolar planets, particularly those of large terrestrial size. It is scheduled for launch on December 22, 2006, and will be the first mission of its kind.\n\nCOROT consists of a 27 cm in diameter afocal telescope with an array of spectroscopic detectors. The satellite has a launch mass of 630 kg, is 4.10 metres long, 1.984 metres in diameter and powered by two solar panels. \n\nA Russian rocket will lift the satellite into a circular polar orbit with an altitude of 827 km. Over its planned 2½ years mission it will observe perpendicular to its orbital plane meaning there will be no Earth occultations, allowing 150 days of continuous observing. During the northern Summer it will observe in an area around Serpens Cauda and during the Winter it will observe in Monoceros. Between this observing periods for 30 days, COROT will observe 5 other patches of the sky.\n\nThe probe will monitor the brightness of stars, watching for the slight dimming that happens in regular intervals when planets transit their primary. COROT will be sensitive enough to detect rocky planets, though only those several times larger than Earth; it is also expected to discover new gas giants, which comprise almost all of the known extrasolar planets.\n\nCOROT will also undertake asteroseismology. It can detect luminosity variations associated with acoustic pulsations of stars. This phenomenon allows calculation of a star's precise mass, age and chemical composition and will aid in comparisons between the sun and other stars.\n\nIn each field of view there will be one main target star for the asteroseismology as well as up to nine other targets. Simultaneously, it will be recording the brightness of 12,000 stars brighter than apparent magnitude 15.5 for the extrasolar planet study. It is expected that a few dozen planets will be found.\n\nTHE KEPLER MISSION\n\nThe scientific objective of the Kepler Mission, due for launch in 2008, is to explore the structure and diversity of planetary systems. This is achieved by surveying a large sample of stars to achieve several goals:\n\nDetermine how many terrestrial and larger planets there are in or near the habitable zone of a wide variety of spectral types of stars \n\nDetermine the range of sizes and shapes of the orbits of these planets \n\nEstimate how many planets there are in multiple-star systems \n\nDetermine the range of orbit size, brightness, size, mass and density of short-period giant planets \n\nIdentify additional members of each discovered planetar
63620
Actually, you're all wrong.  It's 2003 UB313 the recently discovered 10th planet which has not yet been given a perminent name.  As of July, 2005, the planet 2003 UB313 was approximately 97 AU from the sun, over twice the distance between the sun and Pluto (40 AU).\n\nIf you're actually wondering about the 2nd farthes planet (which may be the case as most people don't know about 2003 UB313), most of the time (including the present) it's Pluto, but Pluto has a crazy eliptical orbit (one of the reasons its status as a planet is debatable), and sometimes crosses paths with Neptune.  When I learned the order of the planets in 2nd grade, Neptune was farther away than Pluto, so instead of "my very educated mother just served us nine pizzas," we learned "my very educated mother just served us pistachio nuts."
112968
Here is a site where you can find all the needed data.\nhttp://seds.lpl.arizona.edu/nineplanets/nineplanets/nineplanets.html