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This debate begs and addresses a fundamental question that humans has yet to answer: Are we alone in the universe? The certainty that we are not alone in the universe would have a tremendous impact on our self-perception and would permanently alter our understanding of the universe and how we live our lives.
Even though there are no concrete evidence been found for an alien life, considering the boundless size of the universe, it seems unlikely that Earth is the only planet on which life could develop. Either DNA based or other forms of life that we do not know of.
Based on recent research and scientific theories, this debate assumes that extraterrestrial life exists or has existed. By "life" we refer not only to intelligent beings, but also single or multiple-celled organisms. Life is generally defined as the condition that distinguishes creatures from inorganic matter, including the capacity for growth, reproduction, functional activity, and continual change preceding death.
Start with the number of stars in our galaxy, there are conservatively estimated at 100 billion, though is often cited as three times that number. Of those 100 billion, from 20-50 percent probably harbor planetary systems—an estimate that becomes more and more reliable as the Kepler Space Telescope and various ground-based observatories detect increasing numbers of exoplanets.
It would be extraordinary that life only exist on Earth. The vastness of the universe makes the claim that we are alone, is simply a mathematical error. We humans exist, why cant be no other life forms out there? Saying that there are no aliens out there is like taking a glass scoop of sea water and claiming that there are no whales in the sea. What do you think? Is it probable that other life form exist somewhere out there?