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View Full Version : Did Life on Earth Originate With Comets?



Fraser
2007-Aug-17, 06:45 PM
The traditional thinking is that life on Earth began... on Earth. At some point in our distant past, some mixture of amino acids made the jump from a pool of organic molecules to something more lifelike. ...

Read the full blog entry (http://www.universetoday.com/2007/08/17/did-life-on-earth-originate-with-comets/)

thothicabob
2007-Aug-18, 03:26 AM
The traditional thinking is that life on Earth began... on Earth. At some point in our distant past, some mixture of amino acids made the jump from a pool of organic molecules to something more lifelike. ...

Read the full blog entry (http://www.universetoday.com/2007/08/17/did-life-on-earth-originate-with-comets/)

...and I'd be willing to place a good sized bet on that. However, I have no doubt that key components can, and likely did, come from comets.

I am fairly certain that there are any number of ways that life can arise in a planetary environment; it's also possible it can be 'delivered'. Given the nature of physics and chemistry, I'm firmly in the camp that given conditions and time, life WILL arise, sooner or later.

The only real variables, as I see it, are the specific mechanisms and processes that will be "employed" in any given instance (and I believe there are several available, any of which can happen in different circumstances), and how that life will evolve once it gets started; it's certainly not a given that live will always evolve with the complexity and variety we find on earth - much of that is due to the richness of the environment and the "degrees of freedom" the environment allows for change to occur. It's also just as possible that some worlds can exhibit even more variety than exhibited here. It's all relative.

Life is out there; it may even be nearby Whether or not we have any technological contemporaries as neighbors, however, is very much another question.