Big Bang nucleosynthesis - Wikipedia

Why is the nucleosynthesis era so important in determiningthe chemical composition of the universe.

Nucleosynthesis: The Formation of Elements in the …

In the early universe, the right conditions were present only long enough to synthesize two elements: hydrogen and helium. The heavy elements were created later by extended fusion processes inside of stars, and scattered across the universe when the massive stars exploded, a phenomenon known as a .This stellar debris formed the seeds of comets, planets, and even you! The oxygen and carbon in our bodies could only have been formed inside of stars.

The important point is that theprediction depends critically on the density of baryons (ie neutrons andprotons) at the time of nucleosynthesis.

Big Bang Nucleosynthesis - SuperCDMS

Some of the lightest chemical elements in the universe - in particular, deuterium (a heavy isotope of hydrogen), helium-3, helium-4, and lithium-7 - are created in the early moments of the universe, when the whole universe was hotter than the interior of a star. The amounts of each of these nuclei that were formed depends critically on the conditions in the early universe - in particular, the balance between baryonic matter (protons and neutrons) and non-baryonic matter (neutrinos and exotic particles). Based on these ratios, astronomers have concluded that, in the universe as a whole, dark matter outmasses baryonic matter by a factor of almost 10.


Earlier in its lifetime, the star began fusing hydrogen and helium in its core into heavier elements through the process known as "." The energy made by the fusion of heavier and heavier elements balanced the star against the force of gravity. These reactions continued until they formed iron in the core of the star. At this point, further nucleosynthesis would consume rather than produce energy, so gravity then caused the star to implode and form a dense stellar core known as a neutron star.

what is nucleosynthesis quizlet

As space expanded, temperatures dropped below those required to sustain fusion, and as a result nucleosynthesis only lasted for about three minutes. A third of the atomic hydrogen was converted into helium and no elements heavier than lithium could synthesize.

[1412.1408] Big-Bang Nucleosynthesis - arXiv

Stellar nucleosynthesis is the process by which elements are created within stars by combining the protons and neutrons together from the nuclei of lighter.

Primordial Nucleosynthesis in the Precision Cosmology …

None of the "counting" arguments described above are capable of telling us much about the nature of the dark matter. In particular, these arguments don't help us figure out whether the dark matter is baryonic matter (like gas or dust) or something more exotic. To decide that question we need more information, and one of the strongest pieces of evidence that the dark matter is exotic is Big Bang nucleosynthesis (BBN).

NASA's Cosmicopia - Basics - Composition - Nucleosynthesis

Stellar nucleosynthesis - Wikipedia Stellar nucleosynthesis is the process by which the Quizlet Carbon production required the temperatures and subsequent.

Nucleosynthesis – The Physics Hypertextbook

Where do most of the elements essential for life on Earth come from? The answer: inside the furnaces of stars and the explosions that mark the end of some stars' lives.

Nucleosynthesis | Nuclear Fusion | Nuclear Physics

Stellar nucleosynthesis is the process by which the natural abundances of the chemical elements within stars change due to nuclear fusion reactions in the cores.