It's very likely to be iron because of nuclear binding energy
Iron sits at the maximum of the binding energy curve (see e.g. User Posted Link ) - if you start with small atoms and fuse them - as happens at end-of-life for stars - you keep making bigger and bigger atoms until you hit iron, then it takes more energy to fuse two iron atoms together than you get out, so in the early universe after the first tranche of stars died out you ended up with a lot of iron.
Or at least that's one fairly plausible explanation as to why it might be iron and why there might have been enough of it around to coalesce into the centre of our planet.
Posted By: Partial Angler on June 30th 2009 at 09:28:33
Message Thread
- Aluminium is the most common metal known 'on earth' (ie in the crust). The unreachable cor (General Chat) - Ralf Scrampton, Jun 30, 08:09:24
- If it's unreachable, how do they know? (n/m) (General Chat) - DrDublin, Jun 30, 08:11:20
- It's very likely to be iron because of nuclear binding energy (General Chat) - Partial Angler, Jun 30, 09:28:33
- we don't, that's why it's theoretical, i have read a couple of explanations behind the the (General Chat) - Ralf Scrampton, Jun 30, 08:16:05
- they know because of readings from seismic graphs when earthquakes occur (General Chat) - Tony Martin, Jun 30, 08:21:05
- ^^^ see, the Wrath is better than Wikipedia... (n/m) (General Chat) - Ralf Scrampton, Jun 30, 09:42:22
- ...and Journey to the Centre of the Earth (n/m) (General Chat) - malkybarkid, Jun 30, 08:35:52
- they know because of readings from seismic graphs when earthquakes occur (General Chat) - Tony Martin, Jun 30, 08:21:05
- If it's unreachable, how do they know? (n/m) (General Chat) - DrDublin, Jun 30, 08:11:20
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