[decimon]

Ion cross ping.

[El Sordo]

Nifty.

[texmexis best]

I’ve been wondering where I put that pesky ionized iron line.

Thanks guys.

[Roccus]

We are the stuff of stars.

[RonF]

Hm. Iron in a star is quite significant. No atom heavier than iron can be formed by a fusion reaction that releases energy. Forming any atom bigger than that requires a net consumption of energy. So when a star first starts it's fusion reactions, hydrogen fuses to form helium. Various reactions go from there to fuse atoms into heavier and heavier elements. The heat and radiation from these reactions expands the size of the star and keeps it going. But as the reactions form heavier and heavier elements, each reaction releases less energy than the last.

Eventually the star, filled with iron, stops runnning sufficient fusion reactions to keep it expanded. It then collapses. The jump in pressure kicks off fusion reactions that cause an explosion, a supernova. Atoms heavier than iron are formed in that explosion (lots of energy for a short time, no need to be self-sustaining) and scattered about. Eventually those heavy elements (to an astronomer, "metal" = any element heavier than hydrogen) condense into lumps that may in turn coalesce into planets.

Joni Mitchell and Carl Sagan were right - we all are made of star dust.

You're bound to see some iron in lots of stars, but you don't want to see a lot in the one you're orbiting.

[SunkenCiv]

Wow, thanks decimon. I found the Oliver Manuel folder (he was arrested a couple of years ago for molesting his own children) which is pertinent to this, there's even an FR topic about it, or sort of anyway. And a search shows I reposted #49 in there here. :')

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