Are we the only living species in the entire Universe? The observable Universe is about 90 billion light years in diameter. There are at least 100 billion galaxies in the observable Universe each with 100 to 1000 billion stars. Recently, we have found that planets are also very common, which orbit these stars and there are probably trillions of habitable planets. Which means there is a lot of opportunity for life to develop and exist. But the question is, where is it? And why we have not seen it yet? Even if there are alien civilizations in the other galaxies there is no way we will ever know about them. Basically, everything outside of our local group is out of our reach forever because of the expansion of the Universe. Even, if we had really fast spaceships, it would take billions of years to reach our nearest galaxy. So, finding life there would be impossible for us. So, lets focus on our home galaxy Milky Way. Possibility of Life in Milky Way Our home galaxy, the Milky W
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