The diameter of Earth is a great physical characteristic to know, but do not stop your research there.
http://www.universetoday.com/15055/diameter-of-earth/
Earth is the largest of the terrestrial planets of the inner solar system, bigger than Mercury, Venus and Mars. Radius, diameter and circumference. The mean radius of Earth is 3,959 miles (6,371 kilometers). However, Earth is not quite a sphere.
http://www.space.com/17638-how-big-is-earth.html
The planet's rotation causes it to bulge at the equator. Earth's equatorial diameter is 7,926 miles (12,756 kilometers), but from pole to pole, the diameter is 7,900 miles (12,720 km) — a difference of only 40 miles (64 km).
http://www.space.com/17638-how-big-is-earth.html
The circumference of Earth at the equator is about 24,902 miles (40,075 km), but from pole-to-pole — the meridional circumference — Earth is only 24,860 miles (40,008 km) around. This shape, caused by the flattening at the poles, is called an oblate spheroid. Density, mass and volume.
http://www.space.com/17638-how-big-is-earth.html
The outer core is liquid, the inner core is solid. That's the way Earth has been depicted in textbooks for the past 66 years. But the work of Dziewonski and graduate student Miaki Ishii shows that this picture doesn't get to the bottom of things.
http://www.rense.com/general30/core.htm
Some where close to the 10,000 km mark free moving particles begin to escape Earth’s gravity and are blown away by the solar wind. Even though it extends to 10,000 km, 75% of the Earth’s atmosphere is contained within the 11 km closest to the planet’s surface.
http://www.universetoday.com/15055/diameter-of-earth/
Rense.com. 360 Mile Diameter Spherical Core Found At Center Of Earth By William J. Cromie. for The Harvard Gazette. 10-15-2 LOS ANGELES -- An odd, previously unknown sphere, some 360 miles in diameter, has been found at the bottom of the Earth.
http://www.rense.com/general30/core.htm
Most earth scientists believe the inner core is growing at the expense of the outer core. The solid iron sphere sits in the path of jets and currents roiling the outer core fluids like a big rock in a flowing stream. These patterns of flow might have been altered after the inner core reached a diameter of 360 miles. Afterwards, iron crystals deposited on the inner core surface in a different orientation, creating a different kind of anisotropy.
http://www.rense.com/general30/core.htm
Since the Earth is not a perfect sphere, there are three numbers to know when answering questions about the diameter of Earth. The rotation of the planet has slightly flattened it out, so it has a larger diameter at the equator than at the poles. The equatorial diameter of Earth is 12,756 km, its polar diameter is 12,713 km, and its average diameter, which is referred to in common usage, is 12,742 km.
http://www.universetoday.com/15055/diameter-of-earth/
comparing the size of the Sun to Earth. The diameter of the Sun is 1,392,000 km, while the equatorial diameter of the Earth is 12,756 km. Compared to the Earth the Sun is HUGE. Join us on. Check out our new iSun|trek blog. There’s lots to discover on Sun|trek, so dive in and. start exploring here.
http://www.suntrek.org/sun-as-a-star/sun-and-earth/comparing-size-sun-and-earth.shtml
what is the diameter of earth
The diameter of the Earth is 12,742 kilometers. The diameter of the Earth is 12,742 kilometer.