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Doesn't DNA add/create from existing molecules.. Where does it get new info?
Also, where do the elements come from? Stars? I thought you cannot fuse past Iron?
Originally posted by CALGARIAN
Doesn't DNA add/create from existing molecules.. Where does it get new info?
Also, where do the elements come from? Stars? I thought you cannot fuse past Iron?
Adaptation in the biological sense is generally defined as the process by which a population of organisms becomes better suited to its environment. In this sense what is usually being referred to is heritable genetic change, though it could be learned behavior as well. Usually adaptation is just mutation that happens to help the organism survive in its environment. Mutation is a change in the sequence of base pairs in the DNA of an organism. It will be heritable only if it occurs in gametes (sperm & egg). The difference between the two terms is mostly that mutation can also be negative, and in fact it usually is.
Nuclear fusion in stars converts hydrogen into helium in all stars. In stars less massive than the Sun, this is the only reaction that takes place. In stars more massive than the Sun (but less massive than about 8 solar masses), further reactions that convert helium to carbon and oxygen take place in succesive stages of stellar evolution. In the very massive stars, the reaction chain continues to produce elements like silicon upto iron.
My question is this: If iron fusion seems to be the last step in stellar life, then where did we get all the heavier elements on earth? My understanding is that all of the elements on earth heavier than helium were produced in stellar furnaces. - Star ash.
All of the post-iron elements are formed in supernova explosions themselves. So much energy is released during a supernova explosion that the freed energy and copious free neutrons streaming from the collapsing core drive massive fusion reactions, long past the formation of iron. Sure, this absorbs a lot of energy, but there's plenty available once the explosion has begun.
I guess statistically speaking the heavier elements are much rarer than oxygen, carbon, nitrogen, etc, but does this mean that maybe life is truly really rare (except in our neck of the Milky Way)?
That's right. Supernova nucleosynthesis isn't as efficient as the long years of synthesis in stellar cores.
Have elements heavier than Iron ever been detected outside our Solar System (Like in the emission lines of a nebula, for example - or does the physics model predect them?)
Absolutely. They're everywhere.
For example, the rings of Saturn VIOLATE Newtonian laws of gravity every day ,SO REALLY THEY ARE ONLY RULES at a given space time and may not be true 1 mile away.
Originally posted by supergravity
reply to post by Pauligirl
Your arguments main point is that the ice layer compressing the atmosphere would raise earth temps too high for life, If you read the facts there was nothing on earth at that time, man and everything else was created after this.
The ice layer protected humans and animals from all types of terrestrial radiation, cosmic radiation, solar radiation,ect, etc CAUSING the ageing process to almost STOP. THIS IS WHY PEOPLE LIVED 1000 YEARS.
THIS IS WHY WATER surrounds all nuclear reactors ,it is is ideal for catching lose radiated particles .
Heat from nuclear fission is passed to a working fluid (water or gas), which runs through turbines.