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Because the Earth is not perfectly spherical, no single value serves as its natural radius. Distances from points on the surface to the center range from 6,353 km to 6,384 km (≈3,947-3,968 mi). Several different ways of modeling the Earth as a sphere each yield a convenient mean radius of 6371 km (≈3,959 mi).
While "radius" normally is a characteristic of perfect spheres, the term as employed in this article more generally means the distance from some "center" of the Earth to a point on the surface or on an idealized surface that models the Earth. It can also mean some kind of average of such distances. It can also mean the radius of a sphere whose curvature matches the curvature of the ellipsoidal model of the Earth at a given point.
This article deals primarily with spherical and ellipsoidal models of the Earth. See Figure of the Earth for a more complete discussion of models.
The first scientific estimation of the radius of the earth was given by Eratosthenes.
Earth radius is also used as a unit of distance, especially in astronomy and geology. It is usually denoted by
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What is circumference of the universe?
There are many things man can not prove. This is one of them.
How many digits of pi would you need to calculate the circumference of the known universe to a precision the radius of an atom?
39 decimal places.
What is the size in square miles of the Universe?
First, you would measure the diameter of the Universe in miles, or its volume in cubic miles; but what would you want to measure in square miles?Second, the size of the Universe is not currently known. The observable Universe has a radius of about 46 billion light-years. Convert that to kilometers or miles if you like. One light-year is about 10 million million kilometers. But the entire Universe is probably much, much bigger.First, you would measure the diameter of the Universe in miles, or its volume in cubic miles; but what would you want to measure in square miles?Second, the size of the Universe is not currently known. The observable Universe has a radius of about 46 billion light-years. Convert that to kilometers or miles if you like. One light-year is about 10 million million kilometers. But the entire Universe is probably much, much bigger.First, you would measure the diameter of the Universe in miles, or its volume in cubic miles; but what would you want to measure in square miles?Second, the size of the Universe is not currently known. The observable Universe has a radius of about 46 billion light-years. Convert that to kilometers or miles if you like. One light-year is about 10 million million kilometers. But the entire Universe is probably much, much bigger.First, you would measure the diameter of the Universe in miles, or its volume in cubic miles; but what would you want to measure in square miles?Second, the size of the Universe is not currently known. The observable Universe has a radius of about 46 billion light-years. Convert that to kilometers or miles if you like. One light-year is about 10 million million kilometers. But the entire Universe is probably much, much bigger.
If you calculated the circumference of a circle the size of the known universe requiring that the answer be accurate to within the radius of one proton how many decimal places of pi would you need?
39
Is radius half radius?
No. Radius is half of the diameter.
Circumference of universe within the radius of one newton?
What?!! Radius cannot be measured in Newtons!
What is the radius of the smallest circle in the universe?
approximately zero
What is the extent of your universe?
My universe is believed to have a radius of approx 47 billion light years. How big is yours?
What is the radius of the visible universe?
Roughly 14 billion light years.
What is the radius of big bang?
The Big Bang is the name of an explosion which is believed to have taken place 13.8 billion years ago, and which created the universe as we know it. That explosion is still taking place, since the universe has never stopped expanding (and it is expected that it never will stop expanding, either). The radius of the Big Bang is therefore the same as the radius of the universe. The radius of the universe is thought to be roughly 14 billion light years. (Note that during the inflationary period, the universe expanded faster than the speed of light due to the creation of space, rather than the velocity of the matter involved.)
How much big is the universe?
It is not currently known how big the Universe is. The observable Universe has a radius of about 47 billion light-years; that is, the most distant objects that can be observed in theory are at that distance. The actual Universe is probably quite a bit bigger.
What is the name of all of space and everything in it?
Universe
How old is the origin of Universe?
13.7 billion years or 13,700,000,000 years. Answer2: The Universe may be immortal and have no "age". The size of the universe is such that it would take 16.7 billion years for light to traverse its radius.
What is circumference of the universe?
There are many things man can not prove. This is one of them.
What does it mean by the universe has expaned by a factor of 1000?
That statement is apparently the best way somebody could figure out to express his opinion that the volume of the universe is now 1,000 times as much as it used to be at the time when the radius of the universe was 0.1 of what it is now.
Distance of the universe?
about 80000000000000000000000 miles across ( 8 x 10 to the 22 power). It may be curving back on itself as it expands
Why the universe is black as the sun is present in the universe?
The Universe appears to be dark because space (meaning nothing), contains no matter for the sun to shine on. Also, another reason is that the universe is so large that, if you were to even try to look at the edge of the universe from outer space, the light would not exist beyond a certain point (because of the measurement of lightyears, and the never ending radius of the universe that is expanding). Thus, the universe is black.
