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The possibility of the existence of extraterrestrial civilizations
In the universe,cell phone the earth’s human civilization is established. Because the earth is so short that humans began to create civilized just tens of thousands of years,Wholesale Electronics
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Wholesale Mobile Phone the development of science and technology but hundreds of years, exploring space technology but decades,mobile phone this and the age of the earth and 4.6 billion years age 100 billion to 1.5 billion, compared with different from a drop in the bucket.
Former Soviet astrophysicists card of snow, the civilization husband proposal divided into three types:
Ⅰ type civilization: it can grasp the whole planet. Like the ground ball civilization,wholesale cell phone it can assemble and present the output power of the earth is for communication, the universal energy for 1016 energy. Now we can in one day the earth around us,Wholesale mobile phone and to understand the events of earth, and also can leave on the earth to the moon ShanDianShi access.
Ⅱ type: it can be mastered their own civilization of the stars and planets system of matter and energy resources, the energy for 1026.
It can Ⅲ type: to control their own star system, the energy resources for 1036.
American astronomer Carl sagan suggest, may according to the energy of civilization in three dimensions is divided into 10 times,cell phone accessories namely to 1.0 watts, QNH 1016 1017 watts, 1018 watts model for 1.1 1.2 type, etc. Our earth is 0.7 type of civilization. The three types of civilization is not beyond, but because they have qualitative difference,wholesale cellphone accessories can imagine this process will be very long and difficult.

2 extraterrestrial civilizations equations
In the Milky Way, there exist many of the planet with civilization? In 1960, of the university of California, astronomers frank drake put forward the methods for extraterrestrial civilizations, is that may be a formula: N = R * * * * * en Fp Fi * * Fl Fc L
This formula, it looks a little confused by a series of product possibility cheap cell phone in our galaxy to calculate how much a civilized society may exist (N).
R * represents our Milky Way between the birth of a New Year within the number of stars. Space is from the supernova off pieces (average every 30 years) and forming a cosmic explosion constitute the by-products — hydrogen. Gradually, gravity and new supernova shock effect, these substances in one place, slowly, finally becomes a buildup of stars. This process is repeated.
Fp refers to the formation of new stars, so many planets with average value. Among the stars, called double star, triple star, with two or three of the same size, surrounded by alternately. Somebody thinks that this kind of circumstance cannot form a planet. But in our solar system, not a Jupiter and Saturn such huge planet? It can be regarded as triple double star,cheap mobile phone star, also may have planets triple star. But, a few stars usually this planet, little unsure.
In these planets en, have life risk and evolution of the condition. To make a life, there must be lots of water. However, if the planets, stars far from water will freeze ice, Too close, be turned into vapour. In order to make life evolution, and must have the rock of the land. If the planet, cannot have large volume of these conditions. In addition, still have atmosphere,Digital Picture Frame the asteroid is possible because gravity and flies away, lose the atmosphere. Also, the rotation cycle is too long, not only the temperature is too big, strong winds blowing continuously, also make life difficult.
In these conditions that Fl among the planet, in fact, have life, the proportion of evolution. Evolution, it must have the DNA is extremely complex, huge compounds produced by the formation of the genetic algorithm, and the extremely unlikely.
Fi says life form evolution to wisdom. Bacteria, trees, grass is unable to evolve into an intelligent creatures. They have no brain systems, also did not grow to a certain size of vertebrates. With the nervous system of the spine and most primitive animals is fish.digital camera And the fish in the water is always stay if, must not evolved into intelligent creatures. First fish will become has four legs, can on land and then walk, then climb to fingers grasping and evolution to walk upright. So, your feet and hands division, again after a long time, you will have plenty of wisdom. However, the process must not so smoothly. There are creatures of planetary considerable, but if only bacteria, plants, shellfish, these creatures, so difficult to produce intelligent creatures.
Fc, intelligent creatures can contact with the outside.cheap digital camera Now the earth with waves mainly for interstellar communication mode, but in South America in the depths of the amazon basin, Papua New Guinea, have the mountains uncivilized primitive. They don’t know farming and animal husbandry, make the iron metal products, the technology is lack of use only simple bows and sticks for hunting. They are not only recently from apes evolved into human,wholesale digital camera just like us, they are hundreds of thousands of years ago, has evolved. To have the advanced science and technology, and also to have certain conditions, enough to hold numerous times change and experience accumulation. Therefore, with the wisdom of life, not can achieve high civilization,digital camcorder also won’t have to contact with the outside, so we perceive their existence.
L is representative of the average life expectancy of civilization. The earth also is highly developed, has faced a nuclear war and pollution problems.camera accessories Civilization, the higher the likelihood of a devastating blow,tv mobile phone because it is progress and promote the great powers to destroy it, an incident might make civilization itself.cell phone watch If all the life is very short, so if the other planets have developed civilization,quad band cellphone now already may have perished.
We cannot calculate L and Fc, therefore,tri band cellphones the value for N, scientists have different opinions. Carl sagan is calculated in the galaxy, in every 1 million stars, and a highly advanced extraterrestrial civilizations exist, double sims phone but he extrapolated to the maximum per 100,000 stars have a civilization planet. So SaGen people in China and plug Jed,camera tripod Ⅰ Curie Ⅱ, so close to the distance, there may exist on the stars.