how old is the earth?what is its size?how and when it begin?
468438
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.
714325
our earth is about 4.5 billion years old.\nwell its a mystery that whether all the planets have been created atonce,but\naccording to the big bang theory there was a large explosion resulting in te formation of planets.\nnoone can say this is true or not..
816972
Modern geologists, based on extensive and detailed scientific evidence, consider the age of the Earth to be around 4.567 billion years (4.567×109 years). This age represents a compromise between the oldest-known terrestrial minerals – small crystals of zircon from the Jack Hills of Western Australia – and astronomers' and planetologists' determinations of the age of the solar system based in part on radiometric age dating of meteorite material and lunar samples.\n\nThe radiometric age dating evidence from the zircons further confirms that the Earth is at least 4.404 billion years old. Comparing the mass and luminosity of the Sun to the multitudes of other stars, it appears that the solar system cannot be much older than those rocks. Ca-Al-rich inclusions (inclusions rich in calcium and aluminium) – the oldest known solid constituents within meteorites which are formed within the solar system – are 4.567 billion years old, giving an age for the solar system and an upper limit for the age of the Earth. It is assumed that the accretion of the Earth began soon after the formation of the Ca-Al-rich inclusions and the meteorites. Since the accretion time of the Earth is not exactly known yet, and the predictions from different accretion models vary between several millions up to about 100 million years, the exact age of the Earth is difficult to define.\n\nIn the centuries preceding the scientific revolution, the age of the Earth was determined from the accounts of creation by religious authority. Today some religious groups continue to accept only theological accounts regarding the age of the earth, rejecting scientific evidence which contradicts their beliefs.
778021
The Bible is the Standard in Christianity. The Bible places the age of the earth about 6200 (+/-150) years, whereas evolution dates the earth about 4.5 billion years.  Evolution places death before sin. Dinosaurs died millions of years ago, but the first sin about occurred in the first 100 years after creation. These two will not add up.
155869
The moon is approx. 4.5 billion years old. It is believed to have been formed when a planet the size of Mars smashed into the Earth. Most of the debris fell back to Earth. Some of it stayed in orbit and formed the moon.\n\nInterestingly - the moon may have formed in a few thousand years. During that time, Earth would have been a ringed planet.
851623
Earth's age is based on several things:\n\n1) dating meteorites. When we find a meteorite from this solar system that has a similar composition to earth, you get many young ages, but the oldest and most common date to 4.6 Ga (billion years).\n\n2) isotope trends. When you look at certain radiogenic isotope ratios that change with time, like Rb/Sr or U/Pb, you find that many rocks with differnt ratios of many ages form a line, and the line traces back to an origin of 4.6 Ga as well.\n\nThe oldest life is 3 1/2 Ga, the oldest rock is about 4 Ga, and the oldest date ever found is on the highly durable mineral Zircon from Australia, it's date is 4.2 Ga. So, there is no direct method, it is based on inferences. However, many different inferences lead to the same number 4.559 Ga (to be specific).\n\nYou would have to throw out everything we know and love about Geology to accept a young earth view. When you look at the Grand Canyon, how can you say that only took 6000 years to form?
675326
Earth is about 3.6 billion years ,i dont know the rest.
551572
its only like 6,000 years old because it has been about 2000 years since Jesus came to earth and about 4,000 years before God created the world and the universe check with some bible experts
608831
Don't want to cut and paste it all, but you can find that information on Wikipedia in the third section down "Age and origin of the solar system"\n\nLink: http://en.wikipedia.org/wiki/Solar_system\n\n(Or you can just wait a few minutes until someone else cuts & pastes the whole thing.\n\nSome other good sources:\nhttp://www.nineplanets.org/origin.html\nhttp://www.enchantedlearning.com/subjects/astronomy/solarsystem/origins.shtml\nhttp://www.britannica.com/eb/article-27552
541684
Carbon 14 dating cannot be used to determine the age of the Earth itself.  It has a half-life of only 5730 years, and can only be used on organic materials.  Current techniques can produce accurate results up to about 100 000 years old with Carbon 14, but this is not nearly old enough for the origins of the Earth.\n\nOther methods, such as U-238, or Potassium/Argon (K/Ar) dating can be used on igneous rocks (like volcanic ash, obsidian or granite) to find out when it formed, and have been used to date some of the oldest rocks in the world:  Precambrian granites exposed as part of the Canadian Shield when glaciers scraped all the top layers away during the most recent ice ages (the last of which was a mere 10,000 years ago) have been dated to about 4.2 billion years old, and some Australian zircons have been found to be at least 4.4 billion years old.\n\nHowever even these oldest rocks don't really give us the age of the Earth.  They show us that the Earth must be at least that old, but not exactly when the Earth itself formed.\n\nThe Earth has undergone constant vulcanism and reforming, with oceanic plates sliding under continental plates and being melted and reformed, and even continental plates dividing, subducting, transforming, eroding and being buried under new lava flows.  The oldest ocean beds are Triassic in age, perhaps a mere 300 million years old or less.\n\nHowever meteorites have not undergone this same reworking.  Presumably, most of them would have been formed at the dawn of the solar system, as the sun and planets were accreting from the gas cloud into more solid, spinning forms.  A meteorite from Canyon Diablo has been used as the sort of benchmark test, it is a very large metallic nickel-iron meteorite with sulfide materials, and ideal for most forms of radiometric dating.\n\nThe Canyon Diablo meteorite comes out to 4.567 billion years old.  Other extra-terrestrial rocks, such as the moon rocks, Mars rocks, and other meteorites come out to about the same ages, between 4.53 to 4.58 billion years old.  This range has been determined through a number of different techniques on a wide number of different samples, and they always come out in the same range, thus indicating that it probably accurate.\n\nSo the age of the Earth is generally taken to be about 4.5 to 4.6 billion years.
297260
Earth is 12,742 kilometers (7,900 miles) in diameter.
519862
It is a myth....a bedtime story.  The Earth was formed over millions of years.
527612
Between 12 and 14 billion years.\n\nLearn more here:\n\nhttp://map.gsfc.nasa.gov/m_uni/uni_101age.html
855234
Earth rotates 360 degrees in 24 hours or 15 degrees per hour that it goes through 0,5 degrees of rotation in two Minutes\n\nClick on the URL below for addition information concening the earth rotation. See Item 17\n\nhelios.gsfc.nasa.gov/qa_earth.html \n\n. - - - - - - - - - - - - - - - - - - - - - - - - - -\n\nThe diameter is 7926 Miles\n\nCircumference\n\nc = d π\n\nc = 7916(3.141592654)\n\nc = 24900.26337 miles\n\nClick on the URL below for additional informatio concerning the circumference of the earth\n\nwww.lyberty.com/encyc/articles/earth.html \n\n- - - - - - - - - - - - - - - - - - - - - - - - \n\nSolving for earth rotation per degree in miles\n\n24900 ÷ 360 = 69.16666667\n\nThe earth  rotates 69.2 Miles for each degree of rotation. Rounded to one decimal point.\n\n- - - - - -s-
247560
It depend if you are a religions person or believe in facts. Me, as a geologist I believe in facts and science.\nThe earth forms 4.6 billions years ago. How did we know? By using the radioactive decay method. \nNobody really knows how it form but you can get differrent references. Try historical geology books. \nEarth solidifies around 3 billion years ago, how? From the dated rocks namely Banded Iron Deposits. Life began at PreCambrain era. Meaning 512 millions years ago. Dinosaurs came to life at least 100 million years ago and died 65 miilion years ago because of  a comet hitting the earth.\nActually there are a lot more happend but for your satisfaction try to look for a Historical geology book. A very interesting book.
470910
Bible says, "Earth is 6,000 years old."\n\nArcheology and Ancient History says, "Earth is BILLIONS of years old." Radio Carbon Dating proves this.\n\nI've heard nonsensical retorts from bible thumpers that say, "Oh, yea fossils are caused when lightning hits trees or bones, so that's why there are fossils." (This is BS).\n=========================\nBible says, "Dinosaurs? What dinosaurs?" (makes NO mention of dinosaurs) -- And imagine how long Adam and Eve would have lasted in the Land of Dinosaurs, LOL...\n\nArcheology, Paleontology, Ecology, Pathology, etc. says, "There are 1,000s of species of dinosaurs that are millions of years old".\n\n========================\nBible says, "There was one man and one woman starting out.(Adam and Eve)" -- This would have us believe incest is how we all came about. (Again, completely nonsensical). Next comes the cover story for this:\n\nThey're next retort is to tell the story of the "Tower of Babel".  This story tries to explain that the Adam and Eve family was "miraculously" split into millions of different races!  (AMAZING!).  All the humans decided they'd build a giant pyramid to heaven and overthrow god!  (HAHAHA silly humans! BAM, now you're 1,000 different races and tongues!)  --  What kind of nursery rhyme is this?\n--------------------------------------------------\n ONLY Bush-voting, Rush Limbaugh-listening, Bill O'Reilly- Talking Headed baffoons can believe this kind of s***.\n\nHuman ecology and pathology would show that it is IMPOSSIBLE to have inbreeding like this, without the bad effects.  Humans would be complete mongoloids now with horrible deformities.\n========================\nWhy is evolution so hard to believe?  Given the billions of years it takes for chemicals to react and combine and recombine, things happen.  Synthetic materials are produced, entities are born.\n\nI imagine if bible thumpers didn't know about wind they'd assume that famous rock formations were made by the "hand of god".\n\nReligion should have gone the way of the dinosaur, but sadly, we are stuck in a land of barbarian-like people.  It's easier to believe what you're told to believe, than to think for yourself, thus evolving yourself...\n--------------------------------------------\nChurches are a BILLION-DOLLAR a year industry!\nEach church tells you to give 10% of your income each week!\nIf the average(low) person pays their (10%) or .1*$400/week = $40). Imagine an average church has 200 members.  200 * $40 = $8000 (GASP).  And there are MEGA CHURCHES that have attendances of around 5,000 or so... ($200,000/week) (DROOL)  Who wouldn't want to be a "preacher"?\n\nIf the "preacher" can do his job and get his congregation to believe the bull and create converts, he's basically filling his bankroll with more money.  It's the biggest pyramid(ponzi) scheme in history!
1037575
The Earth is about 12,750 kilometers (km) in diameter.\n\nHere are some answers to some more of your questions:\n\nHow old is the earth?\nThe earth is about 4.5 billion years old. That is 45,000,000,000 years. The sun, the moon, the planets, and nearly everything in our solar system was formed at the same time, so they are all 4.5 billion years old. \nHow does the earth spin?\nIf you look around at planets, stars, and galaxies in the universe you will see that EVERYTHING spins! This is because planets like Earth (and stars and galaxies) formed from a large cloud of gas and dust. As gravity pulled the cloud together, any little bit of spin gets multiplied. This is known to scientists as the Conservation of Angular Momentum. You can try this out yourself. Find a chair that spins easily and sit on it. Start out by spinning with your arms outstretched, then pull them in to your body. Did you notice that the chair started to spin faster when you pulled your arms in? The same thing happens as the planet forms — as its gas, dust, and rocks fall together the planet spins up faster and faster. Later other things can affect the spin. Earth and the moon pull on each other, affecting both their spins and the orbit of the moon. It's quite a dance! \n\nHow fast is the earth spinning and why can't we feel it spin?\nThe circumference of (distance around) the earth is 2 x PI x radius, which turns out to be about 24,000 miles. Since the earth turns once per day (or 24 hours), that is 1,000 miles per hour! We don't feel that because everything else is moving with us and because the motion is very, very smooth. It's kind of like sitting in a car and reading a book or playing a game. If the car is going very smoothly, with no stops or bumps, and you don't look out the window, you wouldn't know you were moving. The only reason we know the earth is turning is because the sun and stars move across the sky. \n\nWhat is the exact tilt of the earth? How much does it change throughout the year?\nThe tilt of the earth is 23.45 degrees. This is measured as the tilt of the earth's equator compared to its orbit around the sun. The amount of the tilt doesn't change with time, but the direction that the earth's poles are pointed does. This is called precession. It is just like the wobbling of a spinning top. The direction that the North Pole (and South Pole) is pointed moves in a circle in the sky very slowly, completing each circle once every 26,000 years. \n\nWhy does only Earth have so much oxygen?\nThat's a very good question — no other planet in the solar system has so much oxygen. The answer is — life! Earth did not originally have a lot of free oxygen in the atmosphere. The oxygen was mostly combined with other elements to make carbon dioxide, water, or in rocks. But as early life evolved, especially plants, well they give off oxygen. So the reason we have so much oxygen in our atmosphere — and we are here and can breathe it! — is due to plant life on the earth! \n\nHow can rockets get through the earth's atmosphere, but comets can't?\nObjects hitting our atmosphere usually burn up because they are hitting it so fast. Usually they are moving at hundreds or thousands of miles per second. Rockets and the shuttle move more slowly (although pretty fast compared to cars on the highway). Here's a comparison. If you jump into a swimming pool from the high board and hit the water really hard, it stings and you make a big splash. But if you step into the water slowly, it feels fine and you make only a little ripple. The same thing happens to meteors — they hit the earth's atmosphere real hard and go splat! \n\nIf a comet hit the earth, what would happen?\nIt could cause a big explosion. The nucleus of a comet is thought to be a mile or two in size. The nucleus is made up of ice and rock, but we aren't sure how solid it is. Something that big hitting the earth from space would be bigger than