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Message: <blockquote data-quote="Wal Bada" data-source="post: 932928" data-attributes="member: 654">Interesting discussion, and I think this is the best thread I have seen in the history of EK. I am going to use two great philosophies to answer the questions whether there are ghosts and aliens.AliensScientifically, there as pessimistic and optimistc theories of extra-terrestrial life forms. According to calculations of pesimisstic theory there have to be 2-3 planets with life forms similar to Earth in Milky way galaxy. When optimistic theory used it rises up to 20,000. Now we get the question why we cannot communicate with them. First reason is the distance. Alpha Centauri is 4.3 light years away. So two way message will take 8.6 years to get a reply. Farthest corners of the galaxy is about 20,000 ly away. So it will take 40,000 years for us to receive answer for our message.Secondly, if that civilization is about 1,000 years behind us, they'll not have radio equpments or telescopes to detect us. If they are million years ahead of us, our communication methods will be obsolete and will not be detected.Then the question comes, what science define as life. Current scientists belive it's a carbon, hydrogen, oxygen and nitrogen compounds make up the life. But there are few bacteria where sulfur has relace oxygen. Hypothesis further extended that there may be Silicon based organisms as Silicon is the cousin of Carbon. But can it end there? That is when we need another knowledge base to answer that question.</blockquote>

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