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Nucleosynthesis - Wikipedia


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 heavier than hydrogen were made by what - Answers.com


Atoms that are heavier than hydrogen were made by nuclear fusion after the big bang. Initially, only the lightest element, hydrogen, was present.

If elements heavier than hydrogen were/are only created through ...


I think I understand your dilemma: you are wondering why, if high temperatures and high .... You assume that heavier atoms at higher temperatures => lighter particles at colder ted ... How were the heavy elements from iron to uranium made?

Origin of elements and stellar evolution


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.

The big bang left the universe with its first atoms

www.haystack.mit.edu/edu/pcr/Astrochemistry/3 - MATTER/nuclear synthesis.pdf

In the very beginning, both space and time were created in the Big Bang. It happened 13.7 ... how helium is made in our sun, the CNO cycle which explains how hydrogen is fused in hotter stars, and the triple alpha process which accounts ... Creating elements heavier than iron requires energy, it doesn't release energy.

Atoms - What are they? What's inside them? - Explain that Stuff


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, ...

Nuclear Fusion Makes Elements Form - Utah Science


You know that everything in the universe is made up of atoms and that those atoms ... Look at the timeline below and notice when the first elements were formed from the ... when hydrogen fuses to form helium and heavier elements such as carbon. ... that even heavier elements than iron are able to form by nuclear fusion.

Cosmic Evolution - Epoch 3 - Stellar Evolution


Most of these elements were discovered toward the end of the 18<sup>th</sup> century and ... To some extent, modern nuclear physics has made real the dream of the medieval ... 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 ...

E=mc^2 - Nuclear Fusion - Energy from Squeezing Atoms Together


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,  ...

NOVA - Official Website | How to Make an Element - PBS


Jan 13, 2012 ... Forging heavier elements from lighter ones used to be the sole ... the carbon in our apple pies were made in the interiors of collapsing stars. ... We have redefined matter and are perhaps the only planet that has ever seen elements heavier than plutonium. ... First, stars fuse hydrogen atoms into helium.

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Origin of the Elements


While the abundance of these more massive ("heavy", A > 4) elements seems quite low, it is important to remember that most of the atoms in our bodies and Earth are a ... The low-mass elements, hydrogen and helium, were produced in the hot, ... Substantial quantities of nuclei more massive than <sup>4</sup>He were not made in the ...

How elements are formed | Sciencelearn Hub


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, ...

Stellar Nucleosynthesis - Astronomy Notes


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 ...