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Since then, as the first people sent their views to the sky, to the planets, stars and galaxies beyond our home world, our imagination filled in the opportunity to find extraterrestrial life. However, when we approach this issue, we still do not have the first compelling evidence of life beyond Earth. Complex, diverse life forms, we see on the Earth, are the result of more than four billion years of evolution. We began to find organic molecules elsewhere in our Solar system, in interstellar space and even other stars. How much time will the Earth have? Today we are searching using four main methods. Some of them just do not know themselves first.
To have life, you need the essential ingredients necessary for life processes: raw materials from the periodic table. You need to have lived and died several generations of stars, pregnansy its nuclear fuel. We found stars with solid planets near by that seven billion years older than Earth, and have all the necessary elements. We found earth-like planets in potentially habitable zones of other stars across the galaxy. We found organic molecules, from sugars and amino acids to ethylformate that gives raspberries its scent, everywhere, from asteroids and young stars to protoplanetary disks and molecular gas clouds.
In General, we believe that in our galaxy the milky Way has over a trillion (1012) planets, and therefore the chances of life. But between the planets with the ingredients and the authentic, high-quality alien life. We do not know whether there are in the Universe. Although scientists strongly suspect that we have no right to make such a conclusion unconstrained by the same ingredients and identical laws of nature, the uniqueness of life on Earth. In fact, we do not even know the answer to the question: as we moved the inanimate to the living?
Our existence proves it’s possible. We can assume that if POPs up anywhere in the Universe, it can achieve three different levels:
Obviously, the more advanced the more we delight and excite the mind, but they are less likely. However, sometimes the rare items are the easiest to find because they stand out against everything else. Here are a few different methods that we can use to search for. Three chances for mankind to find life beyond Earth.
Although life thrives on Earth for billions of years, other worlds seem devoid of such a splendor. If they have a life, she’s probably stuck in a primitive state. Mars and Venus had a wet, warm past, like the Earth, but today Mars is cold and arid, and Venus, a poisonous and hot. Meteorites that fall to the earth contain not only amino acids necessary for life processes, but many other elements that are not associated with biological processes on Earth. The moon like Europe and Enceladus have subsurface oceans of liquid water, which can be hydrothermal vents. At the bottom of the oceans of the earth they are usually associated with life.
Although we have not found evidence of the existence of living beings, past or present, on the other hand, the possibility of such indescribable care. Mars has sedimentary rocks formed by water in the past; if we find fossils, when we dare to dig? On Europa and Enceladus may be the whole oceans are open to study; if we find microbes or something better in water? There is even speculation that diatoms are examples of primitive forms of life which have the extraterrestrial origins. It is the least developed form of life that we can imagine, but we also have many worlds that we can physically get to, visit to measure. If a primitive, simple life will be everywhere, a careful study of our Solar system will reveal it to us.
Over the last 25 years in the region ekzoplanetoy Sciences gave gave Sciences Sciences Sciences Sciences Sciences Sciences Sciences Sciences Sciences or or or or or or or or or or orbiting other stars. Many of these worlds are small, solid and are just the right distance from their stars that allows us to assume that they have atmospheres and liquid water on the surface. We will not be able to find some microbes or fossils to them directly because they are outside the Solar system, but there are indirect methods that we could use to search for life, which is managed to survive and thrive: your planet.
Earth the only known planet with 21% of our atmosphere is O2. Why did it happen? Life had billions of years to nourish the atmosphere with your biological waste. We think that oxygen is necessary for life, but in fact are animals evolved to use this ingredient to find him. With the improvement of our technology, we can measure molecular signatures ekzoplanetoy atmospheres, and perhaps even directly visualize exoplanets in search of clouds, oceans, and continental herbs. We have every reason to believe that a stable life on another planet, if we are right to look for.
Here on Earth, we had a single celled life of billions of years, and then evolved multicellular organisms. It took 500 million years since the Cambrian explosion, to a complex, multicellular, well differentiated life became intelligent, technologically advanced civilization. People have already started to send signals to the stars. The search for extraterrestrial life in an attempt to contact her is a risky, yet effective method of searching for aliens.
In the 1960s we assumed that aliens would try to communicate using radio waves. 50 years have passed, and we’re not so sure. What are the most important types of signals? How do we decipher them? How will they send or receive interstellar signals? Will they conquer the space? If I can overcome the huge distances? All things are possible. If the signal – or, even better, the spacecraft will arrive on Earth, our view of the Universe is completely changed, and our place in this Universe.
Although at the moment this is just a hypothesis, scientists suggest that life in the Universe is likely common, and the ingredients, and the possibilities for its occurrence. Life that thrives and supports itself on the planet, and changes in the atmospheric composition, would be less likely. Complex multicellular life would be more rare. And the birth of the technologically advanced, intelligent civilization would be so incredible. However, whatever chances, we will continue to look. The options we have. No matter which method fires first, the opening day of another life.