Where is everyone? New research says that our Milky Way Galaxy may be home to 2 billion planets that have the right conditions to support life. These planets are said to be in a habitable zone, which means they have the correct temperature to maintain liquid water. While no one knows what alien life would look like, if it is anything like life on earth, it would need water to survive. The possibility of liquid water depends on the planet’s distance from the nearest star. Too close and water evaporates; too far away and water freezes. Recently, scientists have also calculated the effects of clouds on planet temperature, which has increased the estimate of habitable planets to 2 billion. And of course, this is only the number of habitable planets in the Milky Way Galaxy, which is just one of an estimated 100 to 200 billion galaxies in the universe. Wow! The earth was formed 9 billion years after the Big Bang. Many of the planets in the Milky Way were formed millions and some even billions of years before the earth. If intelligent life had developed on any of these planets, they would have had a big head start on humanity. With that much time to develop the technology for space travel, we should have been visited by aliens many times, right? So where is everyone? Of course, some people do believe that aliens have visited earth many times, and the governments of the world are involved in a huge cover-up. Other people believe that we have also been visited many times in the ancient past. They point to the Egyptian pyramids or the enormous heads of Easter Island and say that there was no way that ancient humans were capable of creating these structures without alien assistance. Of course, these theories not are widely accepted. So what about you? Do you think aliens have visited us or do you think we are all alone in the universe? Either answer to this question is equally mysterious and awesome in its own way.
Posted on: Tue, 05 Nov 2013 13:10:15 +0000
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