Planet Earth


planet is a celestial body that is characterized by having a spherical shape and by not having its own light. They revolve around themselves and usually around a star. There are several planets that make up our Solar System and among them we have planet Earth , a rocky planet.

  • Gravity: 9.780327 m / s²
  • Orbital period: 365.256363004 days

What is planet Earth?

Planet Earth is the third planet that we find in the Solar System from the Sun. It is the only planet in this system that can be inhabited and it was formed approximately 4.55 billion years ago from a cloud of cosmic dust and gases.


Characteristics of planet Earth

Many are the characteristics that can be found and observed on planet Earth, the most important of which are mentioned below.

  • In terms of size, the Earth ranks fifth in the Solar System.
  • It is the only planet on which life can be harbored .
  • It is shaped like a sphere and a small flattening can be observed at its poles .
  • Its mass is 5.9736 x 1024 kilograms.
  • It has a density of 5.515 g / cm3, which is the highest in the entire Solar System.
  • It has an acceleration of gravity of 9.780327 m / s2.
  • It is a rocky planet and they also have a solid surface.
  • Liquid metal can be found at its core .
  • It has a surface that is divided into three important layers, the hydrosphere , the atmosphere and the geosphere .
  • It is possible to find a series of elements such as iron, oxygen, sulfur, nickel and calcium.

How the planet Earth was formed

According to scientific studies the planet Earth was formed approximately 4.5 million years ago . The protoplanets suffered several collisions and the Earth originated from these collisions. In each of them, a large amount of energy was released , shaping the Earth. Over time, the dust and rock accumulated to their current size. The gravitational force caused many space objects to collide with the surface of the planet causing many of the materials to melt giving shape to its internal structure .


In the beginning, planet Earth was an extremely hot volcanic body . In this way, little by little the metals that were in the place began to fuse, causing the densest materials to sink, thus shaping the core . On the other hand, materials that were lighter could ascend and that is how the mantle and crust of the Earth were created. This was how the layers of the planet managed to evolve.

With the passage of time the temperature also dropped and many of the craters on the surface were covered by water, thus giving rise to many of the photosynthetic organisms . The atmosphere was also created which gave all the necessary conditions for the planet to be fit for life.


Although the future of planet Earth is still uncertain because many things could change, experts and scientists assure that the planet is changing constantly and at high speed and many of these changes are not positive . The climate is becoming more and more unstable and if it continues in this way, temperatures are likely to rise , the poles will melt and many species of animals will disappear . All this will cause a depletion of natural resources which will mean a huge problem for humans and animals.


If seen from space , the shape of the Earth is spherical , however, due to the rotational movement that occurs on its axis, it can be said that the Earth has a spheroid shape which is also flattened at its poles , for this reason scientists consider its shape to be uneven. The models that exist to represent the Earth vary and the science that is responsible for studying its shape is known as geodesy .

Structure of planet Earth

The structure of the Earth is made up of several internal and external layers and is organized into different groups that depend on the state in which the materials are, solid , semi-liquid , liquid or in the form of gas . Its crust is formed by a series of rigid plates that are supported on the upper mantle, in this way the lithosphere originates . Towards the center of the Earth, in the core , the heaviest materials can be found and they are in liquid form, however, their internal part is solid.

The structure of the Earth is divided or found in several layers which are:

  • Atmosphere : gaseous cover that surrounds the solid part of the planet.
  • Hydrosphere : it is formed by the oceans and by all the aquatic surfaces that exist on the planet.
  • Lithosphere : formed by the earth’s crust and in it are important materials such as oxygen, aluminum, sodium, potassium, hydrogen and phosphorus. It comprises the crust and upper mantle of the Earth.
  • Mantle : it is found or extends from the earth’s crust to approximately 2,900 kilometers deep.
  • Core : it is the central part of the Earth.


The elements found on Earth are a series of chemical materials that together make up the planet. Most of these chemical elements as well as their combinations can be found in solid or liquid state.


The composition of planet Earth is very varied and most of its main components are the following: iron, oxygen, silicon, magnesium, calcium, aluminum and nickel . In the core is mainly iron and on its surface there are mostly rocks and oxides such as potash, soda, silica, iron and lime.


The planet’s atmosphere is a mixture of different stable gases that are surrounding the planet, which are extremely important because they contain oxygen , an essential element for life. The gaseous composition of the atmosphere is oxygen, nitrogen and other gases such as carbon dioxide . It is divided into five different layers that are found covering the solid layer of the Earth. These layers are as follows:

  • Troposphere
  • Stratosphere
  • Mesosphere
  • Ionosphere
  • Exosphere

Color of planet Earth

Viewed from space, planet Earth appears blue with a series of white stripes . This color is due to the fact that 70% of the planet is covered by water. It is also possible to observe green and brown colors that show where the earth’s surface is.


Although in all places on Earth the temperature varies , scientists have established an average temperature to refer to the Earth’s surface. In this way, there are extreme temperatures that reach 55 ° and -60 °, while the average temperature is 15 °.


On planet Earth there are several types of hot , cold and temperate climates . Among them you can find the following:

  • Equatorial climate
  • Tropical climate
  • Subtropical climate
  • Mediterranean climate
  • Chinese weather
  • Oceanic climate
  • Continental weather
  • Polar climate
  • High mountain climate


The natural satellite of the Earth is the Moon which moves around the Earth and is approximately 550,000 kilometers away. It is worth mentioning that today you can also find many artificial satellites which have been created by man.

Location in the solar system

In the Solar System, Earth is the third planet from the sun. It is approximately 150 million kilometers from the solar star.

Rotation and translation

The Earth has two different motions. The rotation is the movement that occurs continuously about an imaginary axis which is known by the name of Earth ‘s axis, an imaginary line that runs from the North Pole to the South Pole. This movement lasts 24 hours and is better known as the day. The translational movement, on the other hand, occurs in an elliptical shape and is carried out by the Earth around the Sun counterclockwise. This movement lasts for 365 days , 5 hours , 57 minutes and 45 seconds .

Magnetic field

The Earth’s magnetic field is basically what keeps us alive, it is a type of invisible energy shield that gives us protection against solar radiation and extends from the core to the limit where the solar wind is .

Life on planet Earth

Earth is the only known place where life can be found, from complex organisms to the simplest. Life originated millions of years ago when the first single-celled beings appeared . Later, living beings with a higher degree of complexity began to emerge until they reached human beings .


The planet Earth can be observed thanks to an Observing System which was created by NASA . This comprises a series of artificial satellites and scientific instruments found in Earth’s orbit which have been manufactured in order to be able to observe and study the Earth’s surface.


Earth is an extremely important planet because it is the only one that has the capacity to host life . It is the only place in the Solar System where it can be inhabited and where there are a series of elements that make it a unique place. It is important for human beings , for animals and for crops because thanks to its elements all of them can develop and evolve.


Some curiosities of the Earth are:

  • The Earth is not entirely round but has a somewhat oval shape.
  • It does not last to rotate on its own axis for 24 hours but it lasts for 23 hours, 56 minutes and 4 seconds.
  • It is always spinning and moving around the sun.
  • Its driest place is known as the Atacama Desert in Chile and Peru.
  • The hottest place on Earth is called Valle de la Muerte is located in California.

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