Describe the formation of the solar system.?
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The fusion reaction explosion sent its matter hurtling at great speed outward in every direction in all sizes and speeds, both gases and molten solids, from the size of small particles to the size of the giant planets. Some of it was hurled out at such a great velocity that it was lost forever to other regions of the galaxy.\n\n# THE BIRTH OF THE SOLAR SYSTEM - About four and one half billion years ago our protosun was slowly collapsing under the force of its gravity. As it did this, due to the immense compression caused by gravity it became extremely hot. Millions of degrees centigrade. The more compact it got, the hotter it got. It was not alone in the sky, it was part of a community of stars and protostars that lay in the outer regions of our galaxy, the Milky Way. It was being swept around the galaxy, along with its neighbors, at the tremendous speed of over 500,000 miles per hour.\n\nSo far it had no satellites, (planets, moons, etc.) it’s gravity had sucked in most of the star dust from its vicinity for hundreds of millions of miles in every direction. It was getting close to the temperature and pressure required for a nuclear fusion reaction to occur. The protosun was like a giant nuclear hydrogen bomb waiting to be detonated.\n\n\n# THE BIG BANG - When this tremendous event finally did occur, the nuclear fusion reactions started up in the hottest most dense area of the Sun. Tremendous amounts of radiant nuclear energy were suddenly created in the innards of the Sun. All of this newly released energy caused a sudden sustained violent increase in the pressure and temperature of the Sun creating tremendous chain reactions throughout its core region.\n\nThese reactions did not just cause the star to began shining. It caused the Sun to violently expand to many times its former size and explode. The explosion sent its matter hurtling at great speed outward in every direction in all sizes and speeds, both gases and molten solids, from the size of small particles to the size of the giant planets. Some of it was hurled out at such a great velocity that it was lost forever to other regions of the galaxy.\n\n# THE BIRTH OF THE PLANETS AND OTHER SOLAR DEBRIS - Much of the debris eventually fell back, into the speeding Sun, if its trajectory was just right. Other debris, after it had expended its outward energy and had not broken free of the Sun's gravity, began to fall back toward the Sun.\n\n\nIt fell back toward the Sun, but due to the Sun's great galactic speed and changing position always missed the Sun. This is the matter that became the planets, moons, comets, asteroids of our solar system. They are the survivors.\n\nIt is like a skeet shooter who always aims directly at the clay pigeon, not allowing for a lead. His shot will never strike the pigeon simply because it will always have moved by the time the shot gets there. This is the basis on how our solar system works. It was a time of tremendous chaos in the solar vicinity, with all the matter rushing back toward the Sun from every direction crashing into each other and falling back into the Sun.\n\n# THE PULSATING SUN - After the initial explosion, the rapidly expanding sun began to cool. As it cooled the area that a fusion reaction could take place became smaller and smaller. Some of the fusion reaction began to shut down. The expansion eventually came to a halt as the fusion energy was no longer powerful enough to sustain the expanding outward momentum. Finally the expansion stopped altogether and then the Sun began to contract.\n\nThis at first stabilized the fusion reaction and then as the gravitational contraction of the Sun continued, the area of the reaction again began to increase. When the Sun had contracted to the point where the area of reaction was again very large, the Sun again expanded and exploded outward with tremendous force sending more matter hurling out into space.\n\n\n# THE STABLE STAR?? - This time however the expansion and explosion was
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When the cloud of gas and dust that formed the sun began to gather together to form the sun, some of it didn't get sucked in by the increasing gravity at the center, but gathered together into less-dense "rings" around the newly-formed sun.\n\nThen gravity did its magic on those gases and dust, gathering them together into smaller balls, the planets. Around some of them were still smaller rings, which gathered together into moons, or, in some cases, more widely dispersed rings.\n\nIf you play with water, stirring it with a pencil to create a little whirlpool, then drop little bits of soil or even food coloring into it, you'll get a feel for how it might have happened. It's not the same, but if you watch it and try, you can imagine how it might have happened.\n\nThen, of course, you'll start wondering about hurricanes. <g>
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Our solar system is tucked into a corner of the galaxy where the stars are scattered far from each other.\n\nThe stars are denser closer to its centre.
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Here is another site.\n\nhttp://www.snyderweb.com/planets/
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Up until the time that the earth started forming, the sun had time (I can't speculate, but probably a few billion years) to begin it's nuclear fusion and begin burning. Sol would have been surrounded by thick clouds of dust, ice and gases (see planetary nebulae). The particles of gas and dust began to clump together into larger and larger pieces and began spinning around the sun either falling in their maintainable orbits or falling back into the sun. These clumps continued to come together and the planets were formed in their respective distances around the sun.
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Earth formed as part of the birth of the solar system: what eventually became the solar system initially existed as a large, rotating cloud of dust and gas. It was composed of hydrogen and helium produced in the Big Bang, as well as heavier elements produced by stars long gone. Then, about 4.6 billion years ago (fifteen to thirty minutes before our imaginary clock started), a nearby star probably became a supernova.\nThe explosion sent a shock wave toward the solar nebula and caused it to contract. \n\nAs the cloud continued to rotate, gravity and inertia flattened the cloud into a disc, perpendicular to its axis of rotation. Most of the mass concentrated in the middle and began to heat up. Meanwhile, as gravity caused matter to condense around dust particles, the rest of the disc started to break up into rings. Small fragments collided and became larger fragments. These included one collection approximately 150 million kilometers from the center: Earth. As the Sun condensed and heated, fusion began, and the resulting solar wind cleared out most of the material in the disc that had not already condensed into larger bodies.
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The Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.
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The sun is only about 4.5 billion years old.  The cloud of gas and dust that it formed out of was probably huge, though.
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In the Solar System Venus and Mars among the planets, the Moon and possibly some of the outer planets satellites such as Ganymede, Triton and even strange little Pluto/Charon maybe very similar to Earth being that all the planets formed from the same cloud of dust, gas and other space debris at the same time around 4.6 billion years ago.
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Simple way to look at this perinnial question. One solar system. One planet like earth froms. Sustains life. Universe is filled with billions of stars. Some the size of our Sun. Some have planets revolving round them. Like earth too. Take a wild guess and u wont be wrong. \n;-)
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When the Sun was born. ;)  4.6 billion years ago.
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Earth formed as part of the birth of the solar system: what eventually became the solar system initially existed as a large, rotating cloud of dust and gas. It was composed of hydrogen and helium produced in the Big Bang, as well as heavier elements produced by stars long gone. Then, about 4.6 billion years ago (fifteen to thirty minutes before our imaginary clock started), a nearby star probably became a supernova. The explosion sent a shock wave toward the solar nebula and caused it to contract. As the cloud continued to rotate, gravity and inertia flattened the cloud into a disc, perpendicular to its axis of rotation. Most of the mass concentrated in the middle and began to heat up. Meanwhile, as gravity caused matter to condense around dust particles, the rest of the disc started to break up into rings. Small fragments collided and became larger fragments.[2] These included one collection approximately 150 million kilometers from the center: Earth. As the Sun condensed and heated, fusion began, and the resulting solar wind cleared out most of the material in the disc that had not already condensed into larger bodies.
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That's a good question. I'm quite sure "God made it" isn't the answer you're looking for, especially since you posted this in the science section. \n\nReligion seems to have all the answers, but those answers never satisfy the appetite of curiosity and learning. Below are several different worded versions of the same basic theory of how the Earth (and other planets) formed. \n\nBe sure to check out the sources.\n\n1. The planets formed from the material left over as a result of our sun's formation. As the nebulous cloud condensed and began to rotate, most of the gas condensed into what is now our sun. The remaining material formed what is now the planets and the other bodies in our solar system.\n\n2. The prevailing theory is that they are formed from those remnants of a nebula that do not condense under gravity to form a protostar. Instead, these remnants become a thin disc of dust and gas revolving around the protostar and begin to condense about local concentrations of mass within the disc. These concentrations become ever more dense until they collapse inward under gravity to form protoplanets. When the protostar has grown such that it ignites to form a star, its solar wind blows away most of the disc's remaining material. Thereafter there still may be many protoplanets orbiting the star or each other, but over time many will collide, either to form a single larger planet or release material for other larger protoplanets or planets to absorb. Meanwhile, protoplanets that have avoided collisions may become moons of larger planets.\n\n3. The most widely accepted model for the origin of the Solar System is called the  nebula theory. Most generally phrased, the theory states that the Solar System condensed from a large, lumpy cloud of cold gas and dust.\n\n4. Solar Nebula Theory
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Do one of our solar system and its relative distance from our sun
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With this information contained...no wonder not anyone really has a handle on the exact definition of a planet.  It will be debated for a long time.\n\n# (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction\n# satellite: a person who follows or serves another\n# any celestial body (other than comets or satellites) that revolves around a star\nwordnet.princeton.edu/perl/webwn\n\n# A planet (from the Greek πλανήτης, planētēs which means "wanderer" or more forcefully "vagrant, tramp") is an object in orbit around a star that is not a star in its own right. Much like "continent," "planet" is a word without a precise definition, with history and culture playing as much of a role as geology and astrophysics (see Definition of planet). ...\nen.wikipedia.org/wiki/Planet\n\n# Overview of the Planets in the Solar System.}\nen.wikipedia.org/wiki/Planet_(Table)\n\n# Planet is a literary magazine based in Wales.\nen.wikipedia.org/wiki/Planet_(magazine)\n\n# An object orbiting a star that is not a brown dwarf but bigger than an asteroid. This is somewhat ambiguous. In our solar system it is really an historical definition which boils down to "a planet is a member of the set {Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto}". All the known planets orbiting other stars are large gas planets so no ambiguity yet arises there. ...\nwww.astro.uio.no/ita/TNP/nineplanets/help.html\n\n# is the term used for a body in orbit around the Sun. The word comes from the Greek planetes, and means "wanderers." Our solar system has nine planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. An easy way to remember their names in the correct order is to keep in mind the following sentence: My Very Educated Mother Just Served Us Nine Pickles. The first letter of each word is the first letter of each planet. ...\nwww.teachervision.fen.com/page/1513.html\n\n# A major object which orbits around a star. In our solar system, there arenine such objects which aretraditionally called "planets'': Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. (There are no "official'' specifications for how big an object must be to be called a planet rather than, for example, an "asteroid.'') While no individual planet has ever been seen orbiting around another star, we wouldn't expect to see them, given the limits of current technology. ...\nwww.astrosociety.org/education/publications/tnl/14/14.html\n\n# A spherical ball of rock and/or gas that orbits a star. The Earth is a planet. Our solar system has nine planets. These planets are, in order of increasing present distance from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Pluto, and Neptune.\naffy50.tripod.com/Glossary.html\n\n# describes any heavenly body which when viewed from Earth appears to move, as distinguished from fixed stars.\nwww.findyourfate.com/faq/p-glossary.htm\n\n# One of nine major bodies that orbit the Sun, visible to us by reflected sunlight.\nastronomy.nju.edu.cn/astron/AT3/GLOSS_P.HTM\n\n# low-mass body that orbits a star.\nschool.discovery.com/curriculumcenter/solarsystem/glossary.html\n\n# there is no set scientific definition for planet (from the Greek planetes “wanderers”), but as a rule of thumb, a planet: 1) must directly orbit a star or an object that has nuclear fusion; 2) must be small enough that it has not undergone internal nuclear fusion (ie, it is not a star or starlike object); and 3) must be large enough that its self-gravity gives it the general shape of a sphere.\nwww.infoplease.com/ipa/A0004425.h
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Actually, all of them simultaneously. Sun and the planets were all formed from the remnant gas cloud of the supernova explosion of a star much larger than Sun. While most of the gas cloud fell back to the center forming our Sun, the most dominant center of the materials in the peripheral volume ended up forming Jupiter, the largest planet.\n\nTherefore when the solar system is in its nascent stage of formation, if you see which proto-planet has formed ahead of other planets, you may see Jupiter to be the first, but other planets have also started developing, depending on what's your yardstick of measurement for calling an object a planet.\n\nClearly 4-5 billion years ago, when the protoplanets were still under development, there were still numerous smaller size objects whirling around Sun and the gas cloud would still not have settled.
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It was formed from the ring of dust and debris orbiting the sun when the sun gained enough mass to start the fusion process.  It was formed in the same way and at the same time as all the other planets.