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.
Oct 22, 2009 ... An element is a pure substance made of atoms that are all of the same type. ... '
Big Bang', only the lightest elements were formed – hydrogen and helium ...
which allows elements heavier than iron, such as uranium and gold, ...
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 ...
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 .....
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
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.
Most of these elements were discovered toward the end of the 18<sup>th</sup> century and
... While in a hydrogen atom, a single electron orbits a single proton, heavier ...
Having a few more or less neutrons than usual, isotopes play important roles in
the ... these artificial (human-made) ones often decay into other elements quickly
Aug 28, 2013 ... AstronomyHow did elements heavier than iron form given that iron is the ... First
off, people usually answer this question saying flat out "they were made in ... In
some kind of super hot environment with lots of hydrogen, a rapid series of ..... It's
also likely that once an atom gets really heavy (past uraniu...
Apr 6, 2016 ... In ancient times, people thought atoms were the smallest possible ... All atoms
are made from the same bits, which are called subatomic ... In other words, an
atom of helium is four times heavier than an atom of hydrogen, ...