Lets say that it's not common and there is only one in a million planet in each system. ... But for more scientific approach we can consider Drake's equation. ... But with recent discovery of other planetary systems, the odds have shifted in favor of life. ... And even more important, this will give us the freedom of solar system. ... If we are introduced with abundant energy, we will have the freedom to travel in the solar system. ...

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• Approx Pages: 12