Paranormal theory on the presence of alien may somewhat circle in alien abduction, UFO and alien encounter. Paranormal experts, particularly on the presence of aliens and UFOs tried to find evidence base on the account of eye witness, pictures, videos and many more. On the other hand, scientists also strive to find alien world from distant stars. They already discovered more than 2,000 planets primarily using the Kepler space telescope. However, finding alien life in alien world is not that easy. In this connection, environmental scientist Dirk Schulze-Makuch, together with his nine colleagues, has proposed a new planet-classification scheme to make searching for alien life a lot easier and organize.
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