1.0 THE WORLD´S OLDEST CIVILIZATIONS.
We are but a tiny spot in the immeasurable universe.
It is estimated that the age of the universe is 13,500 billion years[1] and that of Earth is only 5,000 million years.[2] The presence of Homo sapiens[3] on earth, our oldest closest relative, is approximately 150 thousand years. To compare and have an idea of the time humans have been present on earth in relation to the age of the planet, suppose that 5,000 million years equals one year, humans only appeared on December 31 of that year at about 11:59 P.M. In other words, mankind’s presence is just an "instant", in the life of this wonderful, splendid and generous living being known as planet Earth. However, in a millionth fraction of a second, that is, the past 50 years, human beings are endangering the planet, by their erroneous way of life.
The six civilizations with autonomous origin.
The origin of Earth’s oldest civilizations occurred about 10 thousand years ago. Experts use the emergence date of a culture by the invention of
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- ↑ EFE. Washington.- A NASA probe sent deep into space has determined that the universe was born 13.7 billion years ago, according to the Big Bang astronomical theory.
- ↑ THE BIG BANG THEORY. The solar system began as a diffuse mass of gas and dust that rotated and was slowly concentrated by gravitational forces. The heat generated by this process produced a small sun which weakly shone at the center. From this sun, a flat gas disk broke away and remained in orbit. Gas concentrated inside the disk and eventually formed planets, while the sun contracted and gradually heated. Close to the sun the heavier elements condensed, forming the inner planets, like Earth. Outwards, lighter atoms condensed forming the outer planets.
- ↑ Although there are antecedents, like: Paranthropus (Man of East Africa); Homo-Habilis, who was a tool maker; Australopithecus Africanus; Java Man, Homo Erectus, Homo Sapiens, and Pithecantrhopus Neanderthalis, the best known example of prehistoric man and which appeared in Europe, Asia and Africa 150,000 years ago, and knew the use of fire, carved stones, and manufactured utensils, tools, and hunting weapons, and begun to draw and carve. However, Homo Sapiens, during the last 30,000 years has been the only true human species in the world.
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