Biggest planet in solar syatem?
969856
Saturn.\n\nJust kidding.  It's Jupiter.
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.
576086
It's the biggest planet in our solar system.1300 times larger than earth.It has a storm that has been raging for over 300 years in it's atmosphere called the Great Red Spot.It's also the storm that torn Comet Shoemaker Levy 9 to pieces.One of it's crust layers consists of liquid metallic hydrogen.
217292
Mercury is the closest planet to the Sun. the asteroid belt is located between the 5th planet (Mars) and the planet Jupiter
238633
try this:\nhttp://www.factmonster.com/ipka/A0769141.html#A0769148\n\nMercury: 36 million miles (57.9 million km)\nVenus: 67.24 million miles (108.2 million km)\nEarth: 92.9 million miles (149.6 million km)\nMars: 141.71 million miles (227.9 million km)\nJupiter: 483.88 million miles (778.3 million km)\nSaturn: 887.14 million miles (1,427 million km)\nNeptune: 1,783.98 million miles (2,870 million km)\nUranus: 2,796.46 million miles (4,497 million km)\nPluto: 3,666 million miles (5,900 million km)\n\nKeep in mind that they just found a 10th planet that they're calling Sedna. It's about 10,000 million miles away from the sun. Click here for more: http://news.bbc.co.uk/2/hi/science/nature/3511678.stm
661169
Pluto is the farthest planet from the sun. Its average distance from the sun is 3,670,050,000 miles (5,906,380,000 kilometers).
335341
Wow, just asked my 10year old same question.  He said it is a planet they have recently discovered about twice the distance of Pluto.
820490
Olympus Mons on Mars.  Not sure of the exact height but close to 27 kilometres (about 88,600 feet)!   This is only in "our" solar system, but hey, thats got to be one of the tallest.
491971
The largest "planet" by mass currently known is HD 168443 c, which orbits the star HD 168443, a sunlike star located 123.5 light years from our own solar system. HD 168443 c orbits its star at a distance of 2.87 AU (430.5 million km) and completes one orbit of its star every 1739.5 days. Its mass is known to be at least 17.1 times that of Jupiter, and is suspected to be 34 times that of Jupiter (there is, as you can see, a lot of uncertainty in the measurment). This means that technically, it's considered a small brown dwarf rather than a planet, although the distinction is somewhat academic.\n\nP.S. it's Jupiter, not Jupitar.
507031
It is not a planet.  \n\nIt is still classified as a trans-Neptunian object (TNO), even though it appears to be larger than Pluto.  In fact, some people wonder if Pluto is large enough to be considered a planet, but it's unlikely anybody will "downgrade" it.   I heard a lecturer at Berkeley say that Pluto should really be classified as a 'double-planet' with its moon Charon, which is almost half its size.\n\nIn September of this year (2006) the International Astronomical Union (IAU) will come up with a re-definition of how big something has to be to be called a "planet".  E.g. does it have to be large enough to support an atmosphere.  At that time UB313 may become a planet (and get a cool Greek name).
1052164
Ask those living in other planets!
65145
The newest planet is Sedna. It could be the 10th planet on our solar system.
741499
MERCURY: Closest to sun. Smallest in diameter.\nVENUS: Dense cloud cover. Hot surface temperature.\nEARTH: Home to humanity. High mineral content.\nMARS: Largest volcano (Olympus Mons) in solar system. Largest canyon in the solar system.\nSATURN: Surrounded by rings. Smallest gas giant in our solar system.\nJUPITER: Largest celestial body in the solar system (not counting the sun itself). Deepest gravity and atmosphere well.\nURANUS: It rotates on its side (pole points toward sun). Only planet with a Greek (rather than Roman) name.\nNEPTUNE: Has the largest moon (Triton) to orbit backward around a planet. Has the highest wind velocity (>1400 m/s).\nPLUTO: Alternates with Neptune for being "most distant" from the sun. Hotly debated whether it is actually a "planet".
109794
2003 UB313 is the largest known trans-Neptunian object (TNO) and the most distant known object in the Solar system. It has at least one moon. The object has already been dubbed the tenth planet by the discoverers, NASA, and some media outlets, but it is not yet clear whether it will be widely accepted as a new planet, or whether Pluto will remain classified as a planet.\n...\nThe diameter of 2003 UB313 has only been inferred, not measured directly. The amount of light reflected sets the lower limit for size at 2250 km. The analysis of observations made by the Spitzer space telescope gave only an upper limit of 3,300 km as Spitzer did not detect any heat coming from the object. Newer thermal observations by astrophysicists at the Max Planck Institute for Radio Astronomy (IRAM telescope) have determined the diameter to be in the range 2500-3500 km with a certainty of 68%. [3] The new findings were published in the journal Nature. [4] Initial Hubble Space Telescope observations, taken to measure diameter directly, are still being analysed. Preliminary results revealed by Brown at a public talk at Foothill College in Los Altos Hills, CA suggested that 2003 UB313 has a high albedo of 92% and is nearly identical to Pluto in size (2300-2400 km).[5] However, Brown has now stated that that measurement was wrong, citing that it was a "premilinary estimate." [6]. Brown emphasizes that analysis of the Hubble data is still ongoing, with results expected by the end of February 2006. [7]
47604
Planets: Venus and Mars\n\nMoons: Titan, Europe
682846
Jupiter is the largest planet orbiting our Sun.
670758
Neptune: my favorite planet!\n\nYou have great tastes in planets my friend.  I will gladly help you out.  \n\nNeptune is about 49500 kilometers. in diameter, about four times the size of Earth, which is about 12800 kilometers. in diameter. Neptune and Uranus are almost the same size, but both seem tiny in comparison to mighty Jupiter, which is almost three times as large as either of them. \n\nAlso, At the center, there is a large rocky core about the size of earth, one of the largest cores of the planets.\n\nEnjoy!\n\nThank you for making this question!