Earth origins, definition and study. A-Z index of Cognitio.

The Earth is the third planet in order of distance from the Sun and the greatest of the terrestrial planets of the solar system, for both mass and diameter.

Solar system, definition and study. A-Z Index of Cognitio.

Solar system

It is the primordial place of human beings and in which all known living species live, the only planetary body of the solar system that is capable of sustaining life as conceived and known by us. On its surface, there is water in all three states (solid, liquid and gaseous) and an atmosphere composed mainly of nitrogen and oxygen which, together with the magnetic field that surrounds the planet, protects the Earth from cosmic rays and from solar radiation.

Atmosphere, definition and study. A-Z index of Cognitio.

Atmosphere

The formation of Earth is dated to about 4.54 billion years ago. It has a natural satellite, the Moon, whose age, estimated by analyzing some samples of the oldest rocks, was between 4.29 and 4.56 billion years.

Moon eclipse, definition and study. A-Z index of Cognitio.

Moon eclipse

Its axis of rotation is inclined with respect to the perpendicular to the plane of the ecliptic: this inclination, combined with the revolution of the Earth around the Sun, causes the alternation of the seasons. The primordial atmospheric conditions have been predominantly altered by the presence of life forms, which have created a different ecological balance by shaping the surface of the planet. About 71% of the surface is covered by salt water oceans, while the remaining 29% is represented by the continents and islands. The outer surface is divided into several rigid segments, or tectonic plates, which move along the surface in periods of several million years. The internal part, active from a geological point of view, is composed of a thick relatively solid or plastic layer, called a mantle, and a core, divided in turn into an outer core, where the magnetic field is generated, and solid inner core, consisting mainly of iron and nickel. Anything related to the composition of the inner part of the Earth is still an indirect theory that is lacking in verification and direct observation. The influences exerted on the Earth by outer space are important.

Cosmic space, definition and study. A-Z index of Cognitio.

Cosmic space

In fact, the Moon is at the origin of the phenomenon of the tides, stabilizes the displacement of the Earth’s axis and has slowly modified the length of the planet’s rotation period (slowing it down); a bombardment of comets during the primordial phases played a fundamental role in the formation of the oceans and, in a subsequent period, some impacts of asteroids have caused significant changes in the characteristics of the surface and have altered the present life.

Asteroid, definition and study. A-Z index of Cognitio.

Asteroid

The Earth has often been personified as a deity, more precisely a female deity (probably because it is considered to be the generator of life). In Norse mythology, Jörð, the deity of the Earth was the mother of Thor and the daughter of Nótt and Annar.

In Norse mythology, Jörð, the deity of the Earth was the mother of Thor and the daughter of Nótt and Annar.

In Norse mythology, Jörð, the deity of the Earth was the mother of Thor and the daughter of Nótt and Annar.

The Earth has also been described as a voluminous spaceship, with a life support system requiring maintenance.

The Earth has also been described as a voluminous spaceship, with a life support system requiring maintenance.

The Earth has also been described as a voluminous spaceship, with a life support system requiring maintenance.

A hypothesis according to which the Earth has been visited at least once by extraterrestrials and that, during this visit, they have been able to directly influence fundamental events for the history of our planet.

Extraterrestrial, definition and study. A-Z index of Cognitio.

Extraterrestrial

In a broad sense, then, the “theory” of the ancient astronauts gave rise to real pseudo-scientific currents such as mysterious archaeology, that is a pseudo discipline re-reading the past of humanity and some of its cultural productions as the result of civilization intervention technologically advanced extraterrestrials. At the base there is the very popular idea among Renaissance philosophers that there was a very ancient civilization with unimaginable wisdom and advanced technology. If this reminds you of Atlantis and the myth of the Atlantes, remember well: Atlantis is another of the myths investigated by me.

Atlantis, definition and study. A-Z index of Cognitio.

Atlantis

In 1950 physicist Enrico Fermi made some of his colleagues a question that became famous: where are the others? Humans could in theory colonize the galaxy in a million years, and if so, astronauts from other civilizations could do it in turn.

Ancient Astronaut in Polynesia The mystery of the island of Nuku Hiva. Original article by Alessandro Brizzi.. Original article by Alessandro Brizzi

Ancient Astronaut

So why have not we come to see us yet? This is known as the paradox of Fermi. It may be that they are watching us without interfering: the zoo hypothesis. Or did they come, did they leave some artifact, and did they go because they were dying of boredom? This is the hypothesis of the “ancient astronauts,” the idea that would want pyramid builders alien and so on.

Pyramids, definition and study. A-Z index of Cognitio.

Pyramids

Or could it be that for any intelligent species, the interstellar journey would be too expensive and long? The distance between Earth and the nearest star is just under 40 billion kilometers, excluding the Sun obviously. Or could it be possible, at least in our part of the galaxy, that the most technologically advanced species is ours? Our contemporary culture has not invented the idea of life outside the Earth. The alien is a standard Hollywood character, but not a creation. More than 2000 years ago, Greek philosopher Metrodoro of Chio wrote: “It is unnatural in a field to have only a grain of wheat, and in the infinite universe only a living world.” Four centuries ago, Giordano Bruno was burned to the stake in part because he believed there were planets inhabited in the cosmos.

Earth origins, definition and study. A-Z index of Cognitio.

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Earth origins, definition and study. A-Z index of Cognitio.

Earth origins