Quote:Thank you, Physgrad, for confirming the obvious for us. The stellar lifecycle is anything but a well documented process as Timber asserted, for the simple reason that no one has lived long enough to document such a thing.
That is why I stated it is (at least at present, and for all practical purposes) an unprovable theory. Verifiable evidence to support it cannot be expected to be accumulated for a loooooooooong time, if ever.
Now of course, assuming stars to be of a certain age does not make it so. Lots of other assumptions that have to be made to make this theory "work" deserve to be challenged
okay i'm gonna give this one last shot!!
Did you really think that I meant to support your stance or is that just sarcasm?
first:
Lets differentiate between assumptions and facts
1.No-one is assuming the stars to be of certain age, they are proving the stars to be of certain age. This proof is accomplished by identifying the elements that the stars are burning, rates etc. The identification of elements is accomplished using standard spectroscopic techniques which are proven to work in the lab. I believe freshman physics labs do the spectroscopy experiment, I've TA'd it. So that spectroscopy can identify elements is fact!! No assumptions.
2. It takes a lot more pressure to reach temperatures which would allow you to fuse heavier elements. If lighter elements were still around, then they would burn first..again fact..think of it like using paper to light a log..the paper burns easily and if put together, the paper will burn first.
3. So if you can establish age then observation of stars at different ages samples stellar evolution.
Assumptions:
Not too many..the periodic table..quantum mechanics(for white dwarfs etc.)..certain aspects of nuclear physics..energy mass equivalence..nothing that is not experimentally verifiable.
There is plenty of research in astrophysics, but after you've established certain principles you take research to the next level. You dont sit around questioning facts till you get a result that you want.
Physics is based on observation and experiment, it doesn't matter how you want things to be, you have to modify your theories to fit physical realities.
Also, In physics you need to prove any claims of exceptions. If you believe that 1 particular star is going to evolve contrary to others in the same group(that is others like it), then you better have a real good reason why.
So now I ask you, what assumptions are you referring to? Basic chemistry? Which assumptions in this theory do you want to challenge?
Don't feel too bad about not liking stellar evolution. A lot of people thought galileo was a blasphemer for claiming that the earth revolves around the sun. Something which he concluded after assuming newtonian physics and taking observations.
Noone is asking you to take stellar evolution on faith, I believe a lot of people on this thread have tried to explain it from first principles.
So please, offer a valid objection and then one can debate.