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Anonymous users2024-02-12Round Earth.
Not only is the Earth round, almost all planets are round. This is the law of the universe.
The star formed by the condensation of the nebula--- the early days of the earth was just an asteroid, relying on gravity to continuously capture foreign celestial bodies to strengthen themselves, and the alien celestial bodies are moving at a high speed relative to the earth, so the process of capture is a violent collision. The tremendous energy of the collision caused it to melt into liquid. At this time, the Earth is weightless in space, and the forces are equal in each direction under the gravitational and molecular gravitational forces.
Therefore the liquid substance will become the standard circle. Because only a circle can minimize the gravitational potential energy of each particle. This is the principle of energy minimum.
Because of this, the gravitational differentiation of the Earth's interior (heavy matter sinks to the core, light matter floats on the surface) gives the Earth a circle structure.
Today, scientists on the space station use the method of melting steel to cool in the air to make steel balls, because there is no gravity, the extruded molten steel floats in the air, and the force is equal in each direction under the gravitational pull of atoms and molecules. So it condenses into a flawless ball. Its precision is unattainable with any machining on the earth's surface.
As for the mountains and oceans on the Earth's surface, they are caused by extraterrestrial impacts and plate movements after the Earth cools and solidifies.
Imagine if the Earth's surface today was full of oceans and the Earth did not rotate (the centrifugal force of rotation causes the equator to bulge and the poles to concave to the poles). It should be a standard ball.
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Anonymous users2024-02-11This one... b Khan. The earth was not made by me, it is elliptical and it is really none of my business ...
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Anonymous users2024-02-10First of all, the earth is ellipsoidal, and both round and oval are just describing the plane and are not suitable.
Due to the continuous rotation of the earth, inertial centrifugal force is generated, and there is also the effect of washing machines to dry clothes, so that the earth gradually expands from the poles to the equator, becoming a spinning spheroid with a slightly bulging equator and slightly flattened poles.
But the semi-major axis of this spheroid is not the polar radius, but the equatorial radius.
The semi-major axis of the Earth, i.e., the radius of the Earth's equator, is kilometers, and the semi-minor axis, i.e., the radius of the poles of the Earth, is kilometers, and the flattening ratio is about 1 298
In recent years, the results of artificial earth satellite observations have shown that the equator resembles an ellipse rather than a perfect circle, so the shape of the earth can also be considered a "triaxial ellipsoid".However, these differences are small compared to the average radius of the Earth, so the Earth can still be seen as a sphere when viewed from space.
Hope it helps.
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Anonymous users2024-02-09The Earth is an irregular elliptical sphere with slightly flattened poles and slightly bulging equators. Earth is one of the eight planets in the solar system, the third planet in order from near to far, and it is also the terrestrial planet with the largest diameter, mass and density in the solar system, 100 million kilometers away from the sun.
What is the diameter of the Earth.
The diameter of the Earth is 12,742 kilometers. The Earth's equatorial radius is kilometers, the polar radius is kilometers, and the average radius is about 6371 kilometers. So the average diameter of the Earth is 2 6,371 = 12,742 km.
The Earth is an irregular sphere with a large diameter at the equator and a small diameter at the north and south poles.
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