Possibilities of existence of extra terrestrial life

Well our universe is very large and infinity. We cannot imagine how vast it is? In this entire universe are we the only living organisms in this whole universe. It is very difficult to say yes in this case. So extraterrestrials are those organisms who belongs to other planets but have their existence. In simple word we call them alien. Till today it is only considered hypothetical. We do not have much evidence to confined their existence. There research are going on. The most of the scientist as well as other people believe that they exists. The people have also blamed upon NASA for hiding the evidence of the of UFO's. The scientist on many of their lectures have told them that they also had received SOS call from other planet. We do not know the exact thing. The branch of biology that deals with this extraterrestrial life is known as exobiology. Since most of the people have put there interest onto it, there has been many fiction film made on the reality of the alien. They were also liked by the people as well. According to the different principles there has been arguments going on different scientist for this topic.
      In the same way different photos has been hacked by the hackers from NASA in which they found the pictures of alien from other planets. But NASA didn't agree on it. According to Copernicus principal the earth do not capture a unique place in the universe. In 2000 paleontologist peter ward and his friend astro biologist Donald
Brownlee made many research and finally published a book in which they said that it is very rare to see the complex organisms like on earth but can easily may found the microbial life. But we have the mentality that they may be very much advanced than what we are today.
     In the same way physicists Stephen hawking also have warned the scientist that it may be very harmful if they try to conversate with the aliens because they may capture the earth for the natutal resources and at that time the price we pay becomes very high.  Jared diamond has also supported in his point of thought.
   So the possibility of the existence of this extraterrestrials life also remained mystery till today