What is the size of the planet Jupiter?
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Its equatorial diameter is 142,984 km.
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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!
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Jupiter has a "g" value of approx 26. The calculation can be made possible by simply knowing the Mass and Diameter of the planet, and by bearing in mind Issac's Newton's theory on gravitation.\n\nFgrav=(G*m1*m2)/(d*d)\n\nwhere G is the universal gravitational constant = 6.67*10^ -11 Nm^2/kg^2\nm1=mass of body 1\nm2=mass of body 2\nd=distance between body 1 and 2 (centre to centre)\n\n\nNow consider ur mass to be m2. So the force exterted by u against the planet would be mg=Fgrav. So the value of g simplifies out to be,\n\ng=(G*mass of planet)/d^2\n\nFor Jupiter, \nmass=1.9*10^27 kg\nradius=6.98*10^7 m \nTherefore, g= approx 26
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I'm sure that information is available on one of the NASA sites, I don't have time to look for it right now.  The gravity of Jupiter has been approximated as 2.5 times the gravity of Earth, but the mass of Jupiter is almost 318 times that of the Earth.  For some reason, I was under the impression that mass and gravity were a direct proportion.  I just found that I was wrong today.  Thanks for asking your question; I just became even smarter that I was.
667527
Nice links. I would think that Pluto is still a planet. Its mean radius relative to earth's radius is approximately 0.46. So the diameter at equator might be some 3600 miles. By comparison, a satellite like Nereid, which orbits the planet Neptune, is no more than 200 miles in diameter. At its size Pluto must be a planet.\nI am not sure about Sedna. If we think about the 10-th planet, or the "X" planet, it was thought to be three times as massive as Saturn, and nearly six billion miles from the earth. It looks to me that Sedna might not be our 10-th planet. But then again, perhaps we just have to wait and see.
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Unknown, of course. But the largest planet in our SOLAR SYSTEM is Jupiter.
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The closest moon of Jupiter is Io (Pronounced Eye-Oh).  It is covered with active volcanoes
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Jupiter has 63 known satellites.
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4-Jupiter\nJupiter is the largest planet in the solar system and is a gas giant made up mostly of hydrogen.\n\nComparing Earth and Jupiter\n\nJupiter's diameter is over ten times greater than the Earth's \n\nIt has over 300 times the mass \n\nIf you weigh 180 pounds on Earth, you would weigh 426 pounds at Jupiter's cloud tops \n\nJupiter is five times further from the Sun than the Earth \n\nJupiter is so large that its famous Great Red Spot (actually a giant, hurricane-like storm that's at least 400 years old) would easily swallow the Earth. Jupiter spins so fast on its axis that it bulges noticeably at its equator (a day on Jupiter is about ten hours long).
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Jupiter is the largest planet orbiting our Sun.
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Fact #1 is that Europa is not the smallest moon of Jupiter, it's one of the largest.
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With an orbit of where earth is, 149,600,000 km, that's a surface area of 7.12383E+15 km², i think...\n\nYou can fit approx. 11,700 earths in a single ring around the sun, so you can imagine the amount of materials needed for a dyson sphere is pretty massive! (although Jupiter is more than a 1000 times more massive than the earth!)\n\nI think you might even need to destroy whole solar systems to get the materials required, but the planets, moons & asteriod belt would be a good place to start, assuming you need specific materials like metals especially.\n\nDon't even think about the cost!
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By size and orbit, mainly.\n\nOrbit comes first. Kepler noticed that the gap between Mars and Jupiter was wider than could have been expected, Johann Titius described a systematic and J.E. Bode formulated a rule for the distances of the planetary orbits from the sun. This rule works fine for the inner planets, the missing planet at the asteroid belt, Jupiter, Saturn and Uranus, but places Neptun on a intermediary orbit (about half the distance expectedby the Titius-Bode rule).\n\nWhen Pluto was discovered, its mean distance was about the expected value for the planet behind Uranus, which is why it was classified as a planet.\n\nWith the discovery of Sedna, Pluto now is regarded as a Kuyper Belt object rather than a regular planet.\n\n\nAsteroids come as numerous bodies occupying broadly the same orbit around the sun, without a central planet.\n\n\nBTW, the Earth-Moon system is an oddball in itself, basically a binary planet with the gravity centre between earth and moon forming the planetary orbit around the sun.\n\n\nSize, or surface gravity, is the other criterium. There is no fixed value where a planet begins and planetoids end, but 1/10th of earth gravity could be a useful rule of thumb.\n\nSeveral of the larger moons (earth's, Titan and at least for of Jupiter's moons) would qualify as planets if they had their own solar orbits rather than orbiting a heavier planet. Most of the smaller moons are de facto asteroid/planetoids caught by the  planets.
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http://nssdc.gsfc.nasa.gov/planetary/factsheet/jupiterfact.html
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Just like the Roman god from which it draws its name, the planet Jupiter is mostly hot gas.  We know this primarily from the spectrum of the Sun's light that is reflected by the planet's surface.
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Jupiter is just the largest planet in our solar system-that's like saying uncle Joe in the largest person who ever lived, cause he is the largest person in the family!  We have already identified over a dozen planets much larger than Jupiter in other solar systems.  We havent even identified all the galaxies in the universe (each of which contains around 100 billion stars, each star of which may contain 10 or so planets), let alone seen all the planets there are..
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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