How many solar systems do we know about?
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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.
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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.
321763
the system of a star called sun is is called Solar system.....\nall the systems of stars with planets around them are not solar systems.\nSolar system is name of our sun planets system
58584
All the planets in our solar system
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Multiple star systems are very common. In fact, the closest star to us (Proxima Centauri) is part of just such a system. It was once believed that planets couldn't be in multiple star systems, but of the 166 extrasolar planets so far found, several are in such systems.\n\nAs for our solar system that seems to have just one star, a persistent theory continues that the sun does have a companion star that has an orbit so highly eccentric that it approaches the sun once in several million years. To date, no hard evidence for such a star exists. Also, if Jupiter had more mass, it would have at least started its life as a brown dwarf star.
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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.
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Our solar system now has eight planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.\nThey are arranged outward from the sun as I've listed them.\nThat is with Mercury closest to the sun.\n\nWe also have three "Dwarf Planets"\nCeres, Pluto, and Eris.\nCeres being closest to the sun.
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Solar system is 11 letters in size.\n\nTHE solar system or A solar system are different matters\n\nWe have these things in English called defintite articles. Words like "A" and "THE". Learn them. Use them.
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9 Planets in a Solar Array?
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There are ten planets in our solar system namely mercury,venus,earth mars,jupiter,saturn,uranus,neptune,pluto\nand\n2003-UB313 is the official name of the object that is considered to be a contender for the title of "10th planet". As of August 1st, 2005 the IAU has yet to confirm whether this object will be officially be recognized as the 10th planet in our solar system. This little page will follow events and provide more information when available.\nOfficial Name:  2003 UB313  \nProposed Name:  Unknown\nThe name Xena is rumored to be the name submitted to the IAU for approval, althought there is no official confirmation of the name. "..that was our tongue-in-cheek internal name, never intended for public consumption," says Professor Brown \nDiscovered By: Michael Brown, professor of planetary astronomy at California Institute of Technology (Caltech) and colleagues Chad Trujillo of the Gemini Observatory and David Rabinowitz of Yale University.\n\nFirst photographed in 2003 using a 122cm telescope at the Palomar Observatory. \n \nEstimated Size:  approx 2700 km (1,700 miles) in diameter\nThis is the estimate as of August, 2005. From Wikipedia - Although the object's diameter is not yet well determined, it is estimated to be between 2,390 and 3,550  km . The amount of light it reflects (its albedo ) seems to be quite high, and initial observations show that methane ice is present on the object's surface. Both these properties make it more similar to Pluto than previously discovered large outer solar system planetoids .  \nOrbit: 560 years \nestimated one solar orbit per 560 years.  \nDistance from Sun:\n approx 9 billion miles / 14.4 billion km\nThis is around 100 times the Earth's distance, or 3 times Pluto's distance from the Sun. \nWhere is it Now?  At present, it is near its farthest point from Earth, but in about 280 years, it will be as close as Neptune, (the eighth planet, discovered in 1846).
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Let's count:\n\nMercury has None\nVenus has None\nEarth has 1\nMars has 2\nJupiter has 63\nSaturn has 46\nUranus has 27\nNeptune has 13\nPluto has 3\nUB-313 has 1\n\nThat makes 155 known moons in the solar system, 156 if you count Xena (UB-313) as a planet.
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If your question is : "how much space is in the solar system?" --\n\nThe solar system is a sphere occupying approximately 7.244^29 (7.244 followed by 29 zero's) miles\n\nIf that's not your question then I don't have the foggiest notion of what you're asking.
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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.
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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.
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Our own solar system has 10 planets that we know of:\nMercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto, and the newly discovered 2003 UB313.  That last one is still being contended, and why that debate gets so heated is beyond me.\n\nThere are actually 155 known extrasolar planets, and that number is only going to rapidly increase.  You can find a list on the California & Carnegie Planet Search site below:
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There are about a couple hundred billion stars in our galaxy. The stars close to the center are not likely to have planets because of dynamical considerations (other stars pass by too frequently to have stable orbits).\n\nThe BIG question is how many planets there are per star on average. Our sun has ten planets and assorted other objects. We have found many other planets orbiting other stars, but most of those stars have only one planet (that we have detected). One has three planets that we know about. HOWEVER, the way we detect these planets favors detecting large planets that are very close to their star. Once you start to ask about planets as small as Saturn, or that are farther away than Mercury is from our sun, the methods don't work so well.\n\nThe upshot is that we really just don't know how many planets a typical star has. Some probably have none. How many have none? We don't know. How many have ten smallish planets? We don't know. At best we can guess, say 4-5 on average. This would give close to a trillion planets in our galaxy. The number could easily be a tenth of this, though.
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1 x Star ("Sol"/"The Sun")\n9 x planets\n140 x satellites (moons) [approx.]\nasteroids [1,000s]\ncomets [by guest appearance only]