About Search 4 Xtraterrestrial Life

In this blog, I talk about how aliens might live, how their bodies might function, what types of aliens there might be, and the possible structures in an alien society. I bring you up-to-date news about anything in space involving the possibilities of life. Also, I talk about the histories of our own species, and their endeavors into space. Please subscribe to my blog, and enjoy reading it!

Some posts include: http://search4xtralife.blogspot.com/2008/12/terraforming-morals.html



Sunday, May 16, 2010

How do we Define Life?

Life is very versatile; it comes in many shapes, forms and sizes. So how do we define it? Viruses, for example, are technically not alive because they cannot reproduce independently. They are very small, at 15-25 nanometers long. However, they require forms of life to continue on. On a meteorite that landed on Earth that was originally from Mars, scientists have found very, very, very small objects that look a bit like some microbial life forms here on Earth. Was there once life on Mars? There is much controversy, because the supposed bacteria is much, much smaller than life on Earth. Also, who is to say that they are not just funny-looking natural features? If you have heard of this debate, what do you think?

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