duane has done some great work looking at Dr. Manuel's claims about the Iron Sun theory, that basically says that the sun is not the same as most stars, and is a collection of mostly heavy elements with a hydrogen atmosphere. Note, most serious astronomers regard this as a crackpot theory, but Dr. Manuel is willing to take the time to try and defend it. In it's favor, it does offer something of an explanation to some isotope abundance anomalies among other things.
You can look at a number of web-sites about this theory. Pointers to them are in the previous posts in this thread. I suspect that Dr. Manuel is sincere in his belief in the theory, but in this discussion, I am hoping we can shoot it down [or prove it] without shooting at Dr. Manuel, who has demonstrated that he is a gentleman.
Previous posts in this thread can be seen in the Story Comments -> Discussion: Spitzer looks at a Stellar Nursery
Personally I found this discussion interesting enough that I wanted to pull it out into a properly labelled thread. Note, Josh has suggested moving this thread to Alternative Theories, and I agree it blongs there. I don't know when the move will be made.