IF we made a model of the Milky Way w/ diameter of earth, how big would earth be?
913686
This is a simple ratio problem. The equation would be Dgalaxy/Dearth=Dearth/x so x=(Dearth)^2/Dgalaxy. Asssuming a parsec is 3.6 light years, and a light year is 5.87 trillion miles and the diameter of the Earth is 8,000 miles, then the Earth would be 0.001 millimeter or one micron in size, which is the size of an average bacterium, maybe? Very cool. Oops! I re-did my calculation and I see that I made a factor of ten error. The correct answer is about 0.1 microns, or the size of some viruses. But tell me how you would make such a model of the Earth?
3031
The universe is big enough to contain over 100 billion galaxies, of which the Milky Way is one. It is also expanding. Since it is growing larger, it can't be infinite, since infinitely-sized things can't become larger than infinity.
9885
To answer this question, I'm going to assume the Earth is a perfect sphere.\n\nThe Earth's average radius is about 6.37*10^6 m. Then you can use trignometry to figure out the radius at 38 degrees north.\n\ncos(38 degrees)=r/6.38*10^6 m\nr is about 5.03*10^6 m\nTherefore the diameter is about 1.01*10^7 meters.
934797
Jupiter has a diameter equal to 11.2 times the diameter of Earth.  In terms of volume, the ratio is 11.2^3 = 1405.
264989
You need to be more specific.\n\nWhat exactly do you mean by "Size"? Do you mean if Earth has the same mass as Jupiter, the same Volume as Jupiter, Both?\n\nIf Earth had the mass of Jupiter but the same volume as it has today, gravity would be much stronger.  The force of gravity is largely dependent on the distance away from the center of mass, thus we would be much closer to a larger center of mass.....we would weight A LOT more.\n\nIf Earth has the same mass as it does today, but had the volume of Jupiter gravity would seem to be a lot weaker.  We would be farther away from the Earth's center of mass and gravity would have a weaker effect on us, we would be much lighter.\n\nIf Earth has the same volume and mass as Jupiter, we would weigh more since the increase in volume is more than canceled out by the (excuse the term) massive increase in mass.
937052
The Sun is roughly 100 times the diameter of Earth, which is about one million times the volume.
297260
Earth is 12,742 kilometers (7,900 miles) in diameter.
527781
About 100000 light years diameter.   We're about 30000 light years from the centre.   The centre of the disc part of the galaxy is about 3000 light years thick, and it gets thinner towards the edge.   But there's a spherical halo containing a few stars surrounding the disc structure.
349366
"Diameter: \n Equatorial 12,756.274 km \n Polar 12,713.504 km \n Mean 12,745.594 km"\n\n"At the equator the diameter of the earth is 7927 miles; at the poles, it is very close to 7900 miles. 27 miles, a difference of 0.0034 is just enough to give mapmakers a headache."\n\n"the earth's diameter is 7,912 English miles"
18543
The relative size of Earth, Jupiter, Sun = 1 : 10 : 100
462097
"The equatorial diameter is c.7,926 mi (12,760 km) and the polar diameter 7,900 mi (12,720 km)"\nThe Earth is the fifth largest planet of the solar system. The reason why earth is in a spherical shape, is because of the gravitational pull. The number that appeared most often in my sources was 12,756 km. There are actually two diameters of Earths: equatorial and polar. One of my sources stated that the equatorial diameter is 40 kilometers wider than the polar diameter. The Earth is not a perfect sphere because of a bulge in the equator. Most of the current knowledge of the Earth has been collected in three methods, through satellites, telescopes and outer space exploration.
661020
Mars.  And it's diameter is 4,220 miles.
540447
Let's just talk about Earth. The earth's diameter is 12756 km. Its circumference is pi x 12756 = 40074 km. The earth spins 1 round in 24 hours. That's 1700 km/h, or 472 m/s. If it rotates in an OPPOSITE direction, it's like the Earth is rotating at 944 km/s and suddenly stops. What happens? You fly through the air at 944 km/s. All the houses fly through the air at 944 km/s. Whole forests fly at 944 km/s. Even whole mountain ranges and mountain tips fly at 944 km/s. The ocean's waters fly backward at 944 km/s. Talk about a uber tsunami. I don't know what the friction of air against these object would do to them. Can anyone solve that? Even the Earth's crust might become detached with its outer mantle, I think. Lava breaks out everywhere, global earthquakes... In short: All hell breaks loose. Man, that's even worse than the Death Star. Superman actually does that to Earth in one of his movies. He's a major nut!
791771
Equatorial diameter = 12,756.2 km\nPolar diameter = 12,713.6 km\nVolumetric mean diameter = 12,742.0 km\n\n(BTW there is no such thing as centrifugal force, it's an engineers' myth; there is only inertia.)  :)
220701
We don't yet have the technology to answer this question.\n\nEDIT: To dogoutburner: That's the largest in our galaxy. We have no idea the largest in the universe.
44586
The earth is not a perfect sphere. It's slightly 'wider' than it is tall, so you could measure the circumference at the equator (24,901.55 miles or 40,075.16 kilometers). If you go through the south and north poles (24,859.82 miles or 40,008 km)
1050263
Since the diameter of the sun is 864,000 miles and the diameter of a typical basketball is about 9½ inches (they vary from 9¼ to 9½ inches), if we divide 864,000 miles by 9½ inches, we discover that in our model 1 inch represents roughly 91,000 miles. To see how everything else fits into our model we need only divide any other dimensions of our solar system by 91,000. For example, Mercury, on the average, is about 36,250,000 miles from the sun. If we divide 36,250,000 by 91,000 we find that in our model it is roughly 398 inches-or about 33 feet away from the basketball. And, if we divide Mercury' s diameter of 3050 miles by 91,000, we find that the Mercury in our model is just .034 inches wide-about 1/30 inch. This is smaller than a typical BB. \n\nIf you know your stride (mine is about 2½ feet) you can put the basketball on the ground and pace this off. Better yet, if you have access to a football field at a local high school or college, place a basketball on one of the goal lines and walk out to the 11 yard line. This is where Mercury is.\n\nScientists believe that the solar system was formed when a cloud of gas and dust in space was disturbed, maybe by the explosion of a nearby star (called a supernova). This explosion made waves in space which squeezed the cloud of gas and dust. Squeezing made the cloud start to collapse, as gravity pulled the gas and dust together, forming a solar nebula. Just like a dancer that spins faster as she pulls in her arms, the cloud began to spin as it collapsed. Eventually, the cloud grew hotter and denser in the center, with a disk of gas and dust surrounding it that was hot in the center but cool at the edges. As the disk got thinner and thinner, particles began to stick together and form clumps. Some clumps got bigger, as particles and small clumps stuck to them, eventually forming planets or moons . Near the center of the cloud, where planets like Earth formed, only rocky material could stand the great heat. Icy matter settled in the outer regions of the disk along with rocky material, where the giant planets like Jupiter formed. As the cloud continued to fall in, the center eventually got so hot that it became a star, the Sun, and blew most of the gas and dust of the new solar system with a strong stellar wind. By studying meteorites, which are thought to be left over from this early phase of the solar system, scientists have found that the solar system is about 4,600 million years old!