Te Origen Of Live

The origin of life and the habitability of other worlds, are two of the biggest mysteries facing the science of today. Much research has been devoted to clarifying these issues, but still lackdefinitive answers
Based on these studies, has come to believe that habitable worlds may be divided into four categories, each with a different probability of being home to extraterrestrial organisms. Thishas great potential to assist in the search for life in the universe, particularly as technology advances to the stage where direct observation of extrasolar planets is possible.
first ClassPlanets like Earth, are the first class, and are a kind of "benchmark" for other types, since we know that this kind of worlds is capable of sustaining complex life.
The Earth-like planets have the rightatmosphere, liquid water, moderate temperature ranges and stable climate.

second class
The second class of planets are those that were once worlds like Earth, as in the case of Mars and Venus.Mars became too dry, there is very little water on this planet, at least not liquid water. And Venus became a planet very hot due to the greenhouse effect. "
However, it is thought that there is stillsome possibility of existence of life on these worlds.
It follows that organisms may have developed when the planet was more hospitable, and that life could survive even in the hardest times. "Oncelife is established by itself, is really very difficult to exterminate," says Bredehöft. "In the history of Earth there have been absolutely devastating events that could have wiped out all life, butusually this has served to enhance biodiversity, rather than destroy it."
third
Bodies that possess liquid water, but under an ice surface, comprise the third class of habitable worlds. Europa,Jupiter's moon, is a classic example in our own cosmic neighborhood. Could there be life in places like this? Quw ideas are particularly relevant at this point, because often these worlds do not conform...