Abstract any sign of them, it`s not convincing that

AbstractWiththe development of technology and the input of the space exploration, human knowmore and more about the earth, the solar system, the Milky way system and theuniverse (Hinchey, Sterritt, &Rouff, 2009). At the same time, people aremore curious about the existence of aliens. Do they exist? How`s they looklike? Where are they? However, no one can reallygive the convincing answer. But we can have more possibility to believe whichone is more convincing if we compare what we have found. And in this paper, tojudge whether the aliens exist or not, I research many papers and read the argument from some famous scientists,and then I show three different supporting point of the both sides.

Andfinally, after the three comparisons, I think we have more possibility tobelieve that the aliens do not exist. And I hope people who have the same ideasas I do can provide more convincing evidence to support me and I do welcome theconvincing evidence of the opposite point. IntroductionTheworld is advancing. The society is going ahead. The technology is developing.The space exploration is increasing. Human have more understanding about theearth, the solar system, the Milky way system and the universe.

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In thisprocess, human begin to be curious about the existence of the aliens. Is thereany other life in the space? Do the aliens look like human being? Are thealiens kind and polite to us or impolite and aggressive? So many questionsabout aliens come to us at the same time, however, no one can give a certainanswer and convince all the people in the world. Whereas, comparing thesupporting details of the both sides that aliens do exist and aliens do notexist, we can know which one is more convincing.

Aliens do not exist becausehuman never found any sign of them, it`s not convincing that the strangephenomenon is created by aliens and human haven`t found any comfortable planetlike earth yet.PointAliensmay exist because some scientists believe it and spend money searching them andcontacting them. Some astronomers like Frank Drake trust the existence ofaliens and keep searching the the signals aliens send.

Frank Drake put forwardthe famous equation, the Drake equation, and he predicted that aliens do exist (Hetesi& Regály, 2006). The astronomers use the space telescope to observe thespace and use some equipment to collect the radio signal from the outsides ofearth to analyze whether the signal is valuable. All we have to do is to searchthem and find them out. If the space telescope can take a picture of aliens,how can we say aliens do not exist. All we need to do is spend more money inthe improvement of the space telescope and use it to observe more planet in thedeeper galaxy. Contact by radio wave seems to be the only way we can do now(Moore, 2013). And if the astronomers catch the signal sent by aliens, we canprove the existence of the aliens.

To judge a signal whether is valuable andsent by aliens is not difficult. Distinguish from other noise signal, regularsignals could bring some information (Stromberg, Hassner & Schwiegelshohn,2000). And continue the previous, if the signal is not sent by us human being,it could be sent by the aliens. Take me as an example, I will not open the doorwhen strong wind hitting the door. On the contrary, I will open the door whenmy roommates knocking it. Because the previous one is the irregular noise andthe later one is the regular sound.

And according to this, we can conclude thataliens do exist. However, from we first start to observe the space and collectand analyze the signal till today, we have never gained any valuableinformation about the trace of aliens, our search for the existence of aliensis still zero (Tipler, 1981; Aldiss, 2001). Some scientists like Frank Tiplerthink the aliens do not exist and keeping searching them is a waste of time ofmoney (Tipler, 1981). Because more sophisticated equipment need more money toresearch and develop, spending so much money in to developing the equipment tosearch aliens is valueless.

Hart (1975) agreed that we have never found anydirect evidence of the exist of aliens, and with high possibility, we could bethe only intelligent creature of our galaxy. Combined with the famous FermiParadox, if aliens exist, where are they and what Hart talked, Wesson (1990)shows that even the universe is vast, it still necessary to explain why there isno evidence to prove the exist of aliens. Besides, the Drake equation I mentionbefore is just used to predict the exist of aliens by Frank Drake, onlyprediction is not enough to convince people. So although the suppose of theexistence of aliens is beautiful and the work of searching aliens is stillcontinuing, based on the fact of no direct evidence of the existence of aliens,we have more possibility to conclude that aliens do not exist.