what is the diameter of earth?
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12,756.3 km or 13950459.34 yds
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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
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Well, just our own galaxy is around 1 x 10^18 km across (or 1 x 10^21 m). Lets scale it down to the diameter of the Earth  at 12,750 km, or lets call it around 1 x 10^7 m. This means we would have to scale down the galaxy by a fact of 10^14.\n\nOn this scale, the Earth would have a diameter of around 1 x 10^-10 m. This is about one ten thousandth the diameter of a human hair. So a galaxy the size of the Earth would have and Earth 1/10000th the size of a hair.\n\nIt does not help our concepts of the scales to continue this to the Universe - its just very very big.
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Well, the diameter of the planet is 12,756.3 km.  That would make the radius approximately 6,378 km.  So the radius shoud be an approximation of the distance between the inner core and the surface.\n\nAh ha!  I just look it up and I was right! "Inner core (5000 km - 6370 km below the Earth's surface)."\n:o)
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As far as I know 1.00000 Kilometer = 1000000.00000 Millimeters.\nThe circumference of the earth is 40,000 km Hence: The answer is 40000000 mm
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The earth is one AU from the sun.  One AU is 93 million miles.  The diameter of the solar system is 80 AU.  There are about 6 trillion miles in a light year.  The speed of light is 186,000 miles per second.\n\nPerforming the math.  The solar system has a diameter of .0012 light years.\n\nThe .0012 is derived from the following equeation - 93 million miles times 80AU divided by (186000 miles per second times (365 days times 24 hours times 60 minutes times sixty seconds).
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It would take about 57000 Earths to span the classical diameter of an electron.\n\nThe universe has been in existence for 1.37E+10 years.  It would therefore be somewhere around that many lightyears in radius.  That's 1.296E+23 kilometers.\n\n(In fact, the universe is probably larger than this because of the inflationary expansion during which space appeared as a consequence of the relaxation of the primordial energy that created the universe to begin with.)\n\nEarth's radius is 6378 kilometers, which means that it would take 2.032E+19 Earths to span across the universe.\n\nOn a scale at which the universe is one meter wide, Earth's radius would be 4.921E-20 m.  The classical radius of an electron is 2.82E-15, so the electron (in the real world) would be (classically speaking) 57000 times wider than Earth (in the model).\n\nHowever, the Planck length is 1.616E-35 meters, and so even the scaled down Earth is still 3.045E+15 Planck lengths in radius.  If the Planck length were scaled UP by the same amount, it would still be only about 21 Angstroms long: about the wavelength of x-rays.
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The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometers).
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The diameter of the Earth's orbit around the Sun is about 300,000,000 kilometers
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The diameter of Mars at its equator is 6,794 kilometers (4,222 miles), compared to Earth's 12,756 kilometers (7,928 miles).  This is 53% of Earth's size.\n\nIt also has about 30% of Earth's gravity, 11% of Earth's mass, and 1% of Earth's atmospheric pressure.  Oh, and it has 0% of Earth's population, but that statistic is the most likely of any of them to change.
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The average radius of the Earth is about 6378.1 kilometers, or abnout 6378100 meters.\nCompared to this, a few hundred meters doesnt make a significant difference.\n\nFor reference, the mass of the Earth is about 5.9742 E24 kilograms.\nG = 6.67 E-11\n\nThe gravitational acceleration on the surface of Earth (r = r_E = 6378100 m) is,\ng = G*M / r^2 = about 9.795 m/s^2\nIs the object is now 1 km above the surface of Earth (1000 meters higher), the gravitational acceleration is about 9.792 m/s^2, just .003 m/s^2 smaller, barely noticible.
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I feel the question should be what is the circumference of earth -\nIt is -\nThe average radius of the Earth is 3,959 miles (6,374 kilometers).\nThe equitorial diameter of the Earth (distance from one side of the Earth to the other at the equator) is about 7,926 miles.\n\nThe ratio of the circumference to the diameter of a circle (circumference/diameter) \nis written as the symbol pi. \nPi is approximately 3.141592.\n3.14159265\n3.1415926535\n\nTherefore, to determine the circumference from the diameter given above:\nequitorial diameter x 3.141592 = equitorial circumference\n| |\n7,926 x 3.141592 = 24,900\n| |\nThe earth has a circumference of approximately 24,900 miles.\n\n\nMore precisely the circumference of the earth (or distance around earth)\nat the equator is 24,902 mi / 40,076 km. \n\nso the answer is 24,902 miles or 40,076 kms.
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The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometers).\nBut, if you measure the earth through the poles the circumference is a bit shorter - 24,859.82 miles (40,008 km). This the earth is a tad wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like).
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The diametre of earth at the equator is about 12756 km (7926 mi). And at the poles it is 12713 km (7899 mi).\nThat is 43 km (27 mi) less than the equatorial diameter.
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the radius of the Earth 6375.654784689 Km. There are many living things on it and it will not be ever counted exactly.
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http://hypertextbook.com/facts/2001/DanielChen.shtml\n\nEarth has a surface area of 196,940,400 square miles, slightly less than a perfect ball with a diameter of 7913.5 miles (which is the mean diameter of the Earth - see "Prove it" under 103).\n\nhttp://pages.prodigy.net/jhonig/bignum/qland2.html
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You know you can find this stuff with google, right?\nHalley's Comet is about 1/10 of one percent the diameter of Earth, although it isn't really round. Its density is about 55 times less than Earth which would make it's mass about 0.000000002% of Earth.