[scentoni]

Wrong, it really does mean that it takes energy input to fuse iron and hydrogen. Naturally existing heavy elements are the result of supernovas, where a percentage of the energy of the dying star is converted to fusing elements beyond iron.

[smaddox]

Indeed. Oblig. hyperphysics: http://hyperphysics.phy-astr.gsu.edu/hbase/nucene/nucbin.htm...