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...of its demise) it may stop at fusing helium or continue on to fuse heavier elements up to iron. ...gen from the gases of the white dwarf's companion, and there are few heavy elements in its spectrum.

These giant stars and supernovae left behind all the elements on the periodic table. They also left behind ... black holes ... black hole

== Elements == ...sted in the [http://en.wikipedia.org/wiki/Periodic_table Periodic Table of Elements]. Each has an atomic number, the number of protons in that atom. Hydrogen (

...ightly denser grew more dense under their own gravity. Free of the heavier elements that limit the growth of today's new stars, these collapsing protostars gre ...brighter, and lacking the carbon, nitrogen, oxygen, iron and other heavier elements we find in stars today.

All of these things are made up of hydrogen from the Big Bang, elements fused in stars, and compounds mostly formed in the interstellar medium and ...ere today. Supernova debris would in that vicinity would have heavy enough elements to create planets, and even life.