How many planets are tehre in universe? and their size?
142823
As time goes on, we will be learning more and more about the planets that exist, and their size distribution. \n\nThe really large planets are probably gas giants, from what we can tell. The smaller planets are rocky planets, probably. We use two main methods of detecting extrasolar planets:\n\n1. Looking for wobbles caused by the extrasolar planet. \n\nIf the extrasolar planet is big enough and close enough to the star, then the star will be pulled sideways as it orbits the system barycenter, and we can detect that. This method is mainly useful for detecting gas giants, like Jupiter.  \n\n2. Looking for planetary transits\n\nBy looking for a pattern of repeating shadows caused by an extrasolar planet passing in front of a star, we can detect extrasolar planets. This transit method has not found as many planets yet as the wobble  method, but theoretically should be able to find much smaller planets, possibly even small rocky planets like earth.\n\nThere are several projects worldwide now (a couple of dozen or more) developing programs to find new extrasolar planets, so in the next few years there should be a large population of new planets found. So far, we know of about 150 extrasolar planets, most of which are gas giants. \n\nHowever, even if a lot of data are analyzed, from many many stars, using our best methods, our statistics will still be biased towards the largest planets, since those are the ones we can detect most easily. \n\nSome estimate that there might be planets around almost every star, and there could be several around every star, so there could be a LOT of planets in the universe. Very few will be in the habitable zone and of the right size for human habitation, but some probably will be.
1006929
Seriously, this is funny. Anyhow, there is absolutely no way of knowing how many planets exist in the entire universe as the universe as we know it is far to huge for any of our technology to fully explore. \n\nAnyhow, please stick with the topic. This has absolutely NOTHING to do with computers.\n\nThanks!
15235
It is estimated that there are approximately 200 million stars in the Milky Way and each one has the potential to have a "solar system" of some type.  Depends on many factors and the type of planets that can exist around a particular star also have many factors.  A number of "solar systems" have been found around other stars.  A current list of them can be found at exoplanets.org
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"
598363
Well, they go in diameter, Jupiter, Saturn, Uranus Neptune Earth Venus Mars Mercury Pluto, so \nJ S U N E V M M P  so why not have: \nJust Say Upto Nine Easy Very Merry Mighty Planets
44714
Universe is ONE and it is ever expanding.\n\nThere are many solar systems like ours in our Galaxy. There are billions of galaxies in the universe.\n\nIf you are interested to know more, check the site http://www.space.com site.
306098
Jupiters the biggest in our solar system, but the universe is pretty effing big.  There are probably billions of planets in the universe.  Ask God.
185861
Universe in general is the area of everything including earth, solar systems, nebulas, black holes, galaxies etc are contained within. Everything that is observable to us(human) are so far within this universe. So maybe there are more but to human.. there is only 1.
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.
492408
in our solar system 12\nin our galaxy 245658421\nin whole world 87541245632156125
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.
108382
As of right now we don't know sizes of other planets outside our solar system.\n\n But, Jupiter is the largest planet in the Solar System. With an equatorial diameter of 143,884 km, (89,405 miles), it is as wide as more than 11 Earths stacked side by side. The planet also has the shortest period of rotation - Jupiter days last just under ten hours.
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
1091585
You've awakened the starry-eyed dreamer in me at this late hour!  I should be sleeping, but can't resist your question.\n\nHow many other planets, do I think?  Actually my number is a lot higher than millions!  In fact, on this subject you get into numbers so large that most of us humans cannot relate them to anything in our experience.  So, sadly, I doubt we can appreciate the grandeur of the universe.  But let me try...\n\nOne fairly recent estimate says there are 70 sextillion *visible stars* in range of modern telescopes (70,000 million million million).\n\nTo help put that in perspective, I'll use a rather old but useful analogy.  Imagine scooping up a big handful of sand at the beach. Try counting the grains of sand.  You'll give up, most likely, in seconds, assuming you even bother to try.  Now look all around you on the beach, and think about *that* number.  Now think about all the grains of sand on *all the world's* beaches... and deserts.  Now multiply that total number by ten, and you get approximately the number above -- of stars in the *known* universe.  The stars not visible to us by even our most powerful telescopes may equal the visible figure -- or be multiples of it.  Mind-boggling, no?\n\nSo to your planet question:  One next has to wonder how many of those stars are actually a sun to one or more planets (hey, I just noticed that was your wording, too; I like it).  Does every star have at least one planet revolving about it?  \n\nWell let's just be very conservative and say that there are only 70 sextillion stars in the *entire* (not just known) universe.  Let's further say that only one tenth of those stars (7 sextillion) have a planet orbiting them.  If we assume merely one planet per sun, then there must be at least 7 sextillion planets in the universe.  Using our sand analogy, that's a planet per grain of sand on all the world's beaches and deserts!\n\nAnyone who believes that is a reasonable number must surely wonder, "How could there NOT be living beings somewhere other than the earth?"  \n\nOf course not all planets will have life on them.  Earth may be the only body in our solar system, for example, which does harbor life, though at least one of Jupiter's moons is also a tantalizing possibility.\n\nIf only one out of a *thousand* of those planets are earth-like -- in the sense that they are rocky, not gaseous, and contain liquid water -- there may be 7 quintillion earth-like planets in the universe.  That's 7,000 thousand trillion.  I've been very careful, but if my math or estimates are off by even a factor of a *billion* there could be 7,000 million earth-like planets in the universe, a figure I think is extremely low.\n\nThese figures seems to jibe fairly well with an estimate of the number of earth-like planets in our galaxy alone, found at space.com (the bottom link in my sources) -- 30 billion, from a 2002 article.\n\nMy personal belief, based on numbers such as this, and on the likelihood that any planet supporting life may contain (extremely conservatively!) a thousand species...  is that there are *billions* of intelligent species in the universe outside the earth.\n\nSince you were wise to point out that we reside in the Milky Way galaxy, which is only one of perhaps billions of galaxies, you might be fascinated by the Hubble photo in the references, below.  I liked it so much, myself, that I made it my new desktop wallpaper.\n\nFinally, on the specific subject of life, there is a well-known method of estimating the number of intelligent, communicating civilizations, called the Drake Equation.  In my references you can see how it works to condense all the possible stars down by multiple factors, leaving the fraction which we may be able to communicate with, or at least hear from!  \n\nHappy dreaming (for me, too), and I hope you are as inspired by all this as I am.   :-)
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.
45656
Designated 2003 UB313 (it hasn’t been officially named yet), this “planet” is slightly larger than Pluto, has a small moon and takes more than 500 Earth years to orbit the Sun.\nA planet is a body large enough that, when it formed, it condensed under its own gravity to be shaped like a sphere. It orbits a star directly and is not a moon of another planet.\n To simplify things, some scientists propose that the size of Pluto be designated the smallest size for a planet. If that argument carries the day, we now have 10 planets, since 2003 UB313 meets all the criteria.
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!!!