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quote:Originally posted by ukmickyCould there be life on other planets. If you go by earths example then shouldnt the anwser be,unlikely.The earth has been around for about 5 billion years, and yet life has only started here once, as all life on earth is related.once in 5 billion years would mean life must be so hard to start in the first instance that maybe life on earth is just a fluke There are also many other factors that have got be taken into account which has aided life and complex life on our planet to survive. Like our position in our galaxy,our type and size of our sun and the fact that its not a binary. Jupiter handy for removing the odd comet that comes our way. the moon. the tilt of our planet very handy that. the size of our planet and its position in our solar system ,it's molten core , magnetisphere. oxygen nitrogen mix. the list could go on for ever.May be our planet is unique and the life on it is unique. is it so unlikley that we are alone,could we be the first. Michael
quote:The first forms of cellular life required membranes that were probably made of amphiphilic compounds such as lipids and phospholipids. Lipid membranes are crucial to the structure and function of all cells and their role in the origin and evolution of life is of considerable interest.
quote:Originally posted by UltimaDefine what you mean by Life! damn it! 
quote:Originally posted by UltimaI have a question that might clear things up. I consider Viruses, Prions and Viroids in some form to be "alive" although they can't do everything themselves they are a persistent replicating form, they act on a different scale to cells persisting more through chemical reaction than active involvement with the environment around them. Do you consider them a form of life? If so thats instantly one form of life that is very different from a cell. A Prion isn't even genetic! It certainly wouldn't have evolved from a cell or vice-versa. I know any biologist wouldn't agree with me, but hey I can be as deluded as I like 
quote:Originally posted by ukmickyWHAT IS LIFE?I suppose for something to be classed as life has to be able to feed to take in energy,and also has to be able to reproduceMichael
quote:Originally posted by ukmickyanother_someoneyeah it was partial,i was in a rush had to go to pc world before it closed ok life as we know it can independently respond to its surroundings,grow and develop, reproduce, take in energy. and is made up of one or more cells.which basically rules out all of the aboveMichael
quote:Finding life isn't exactly easy--scientists aren't even satisfied yet that they have a definition for life that would work for any planet. It's a little easier to define what it means on Earth, but have we fully considered what alien life might be like? What if we were only looking for Earth-like life, and missed the other kinds of life that might be possible?
quote:Originally posted by neilepWhile you debate about the definition of life, I still maintain that out there, amongst the cosmos is someone probably unlike myself..and unlike yourself (or even very much like ourselves) who is also debating about life elsewhere in the cosmos.Men are the same as women.... just inside out !!