Aliens really came to the Earth?.

<P> Keywords: alien extraterrestrial extraterrestrial extraterrestrial biological life </ P> <P> MSNBC website recently outside the United States there may be extraterrestrial life were signs of the 6 inventory, these signs may mean that human beings in the universe and .alone. .</ P> <P> Technology (tech.) The following is the existence of extraterrestrial life may be signs of the 6. .</ P> <P> 1. The large number of stars, there is the possibility of extraterrestrial life greatly </ P> <P align=center> </ P> <P> cluster Hubble telescope pictures </ P> .<P> SETI program (hereinafter referred to SETI) Institute Shostak, senior astronomer said, although they have not found direct evidence that the world beyond the earth there is life, but after all, the universe has a surprising number of stars, so ., there is the possibility of not only alien, but also be large. .Over the past 10 years, studies have shown that at least half of the universe of stars as planets, "Harbor." .According to Shostak estimated that the number of planets in the Milky Way alone a staggering 1 trillion to as much. .He said: "One must have experienced some of the planet Earth and have gone through the process of life, these organisms eventually evolved into what we call 'a perception of life'." He pointed out that this is just one possibility. ."If human beings across the galaxy or even the only intelligent life throughout the universe, that we do is a miracle." The text of the picture from the Hubble Space Telescope, shows the young stars in the Milky Way. .</ P> <P> 2. Solar system there are a lot of water the world </ P> <P align=center> </ P> <P> Enceladus, "Enceladus" </ P> <P> As we .know that water is life, there is generated and a key element. .In our solar system in which, the presence of liquid water is actually very common. .More and more evidence that Mars may be flowing underground liquid water. .A satellite of Jupiter - Europa "Europa" seems to be the existence of a liquid ocean. .The other two satellites - Callisto "Callisto" and Ganymede "Gainimide" also may be a water world. .In addition, water may be all over the footprints of two satellites of Saturn - Titan, "Titan", and Enceladus, "Enceladus." .Shostak said: "There has been found that liquid water may exist in 7 to the outside world, which is obviously a very exciting news." </ P> <P> 3. Life on Earth "fast" evolution </ P .> <P> Scientists estimate about the history of the Earth 4.5 billion years. .The earliest evidence of the origin of life 3.4 billion years ago in Australia called "stromatolites" bacteria seats. .In view of these bacteria have been with the complexity of biology, scientists believe that life forms produced by them may be in 34 million years ago, has been based on the earth above. .Shostak said: "This is not entirely impossible, after all, the speed of evolution of life too fast." But need a reminder that this evolution of the Earth as the lottery, the other planets do not like it this way .so lucky. .</ P> <P> </ p>.