Nucleosynthesis is the process that creates new atomic nuclei from pre-existing
nucleons, primarily protons and neutrons. The first nuclei were formed about
three minutes after the Big Bang, through...
Atoms that are heavier than hydrogen were made by nuclear fusion after the big
bang. Initially, only the lightest element, hydrogen, was present.
Jun 8, 2010 ... All of the atoms on the Earth except hydrogen and most of the helium are ... made
of carbon atoms, hydrogen atoms, and oxygen atoms (C6H12O6). ... The atoms
heavier than helium up to the iron and nickel atoms were made ...
If elements heavier than hydrogen were/are only created through star fusion and
.... star that did not allow even protons and neutrons to exist, let alone atoms. ... If
iron is the heaviest element made by nuclear fusion, then how do we have so ...
Sep 10, 2004 ... Hydrogen is the simplest possible atom by definition, one proton and one ... the
universe was also expanding, and the chances of collision were getting smaller.
... Elements heavier than iron are made in such explosions.
Their relative abundance (by weight) was 75% hydrogen and 25% helium. ...
Second, the atoms were becoming packed more tightly, increasing the density, ...
(lower temperature and pressure) than the carbon-nitrogen-oxygen cycle. ... the
temperature and density to reach levels where C nuclei can fuse into heavier
Jun 27, 2015 ... The lightest elements (hydrogen, helium, deuterium, lithium) were produced ... In
stars less massive than the Sun, this is the only reaction that takes place. ... (
Intermediate) · Why will fusion wait until hydrogen is gone before starting to fuse
heavier atoms? ... (Advanced) · Was the Sun made in a super...
Dec 2, 2010 ... Just what do astronomers mean when they say we're all made of star stuff ... All
except atoms of hydrogen and one or two of the next lightest elements. They
were formed even earlier, shortly after the Big Bang began 13.7 billion years ago.
.... But stars do form elements heavier than iron, including cherished .....
For example, it had been calculated that if the Sun was made of coal it would use
up .... Fusion is possible in atoms other than hydrogen and helium. ... For iron,
and all heavier atoms, we need to put more energy in than we get back out .... For
these reasons, nuclear weapons tests were eventually carried out under ground,
Nuclear fusion involves two atomic nuclei joining to make a large nucleus.
Energy is released ... A hyrdogen-1 nucleus is made of 1 proton. This can
combine ... Heavier elements than hydrogen and helium (up to iron) are formed.