What is an alien life?

Extratestric is defined as things placed or that occur outside the ground or not in the atmosphere of the Earth, while the term life is much more difficult to define. For the purposes of defining extraterrestrial life, it could be the easiest to say that life would be anything that lives, from unicellular organisms to multi -lined complex organisms (such as plants or animals) that do not come from the ground. Depending on the ideas and theories of a person, extraterrestrial life can conjure up the images of aliens with position -bumanoid features and with sufficient intelligence to eventually contact people. Alternatively, some people may perceive life forms on other planets as mostly microbial in nature and suggest that Earth is the only planet where life has developed in more complex forms. Evidence at the end of 2000 The presence of methane gas in Mars atmosphere can also indicate some primitive life forms, but this gas can also be created by geochemical reactions. In the scientific communityThere is certainly a great support for the idea that there are simple life forms on other planets, but less complete support for the idea that there are complex forms of intelligent life, although it still supports the imagination of science -fi and the general public.

There are many precedens in extraterrestrial life. Several ancient Greek astronomers assumed that there must be residents on other planets. The expression that God created in other worlds appears in the Jewish Talmud, Qu'ran and in many Hindu texts. As astronomy has become more advanced, the ability to see the numerous planets that exist, and many stars through Things have made it more likely that life on other planets must exist that the Earth could not be unique as the only planet of life in Galaxy or argued. It was argued from religious andScientific perspectives, although some religious perspectives have also been argued that Earth is the only planet to which life exists.

One ambitious project that sought signs of extraterrestrial life, is Seti or searching for extraterrestrial intelligence, which, among other things, sent signals through the transmission of radio waves and continues to analyze radio wave signals as potential evidence of life outside the country. The program did not find definitive evidence of life elsewhere, but for many people who believe that other planets have an intelligent life, it can only be proof that these forms of life use other ways of transmitting signals. There is also some concerns about what is called Active Seti (sending messages), because it assume that an extraterrestrial life will welcome Earthlings with open arms. Life elsewhere could be hostile and Earthlings may be better not to say other forms of life of their presence in space.

Carl Sagan said: “The universe may not be in perfect harmnii with human ambitions. ” This is one of the difficulties in looking for extraterrestrial life. It is good to look for the simplest unicellular body for humans, because it did not develop in the same structure as human, plants and bacterial development on Earth and it is difficult to know how such an organism would potentially interact with earthly beings to maintain life;

But many planets in space and even in this galaxy remain a sore temptation. Are an open invitation to search to see if people and other form arey Life on Earth in space indeed alone. Is it all an empty rock and infertile nothingness, or are these planets are teeming with life and represent the variety of species and development like Earth?