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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.

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.

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?

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 ...

The Only Three Heavy Elements In The Universe That Aren't Made ...


Jul 1, 2015 ... You see, the Universe starts off with hydrogen and helium, all stars ... In fact, you can't make the first of the heavier-than-helium elements in ...

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.

BBC - GCSE Bitesize: Fusion in stars


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. Elements ...

Nuclear Fusion Makes Elements Form


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.

Why did the Universe start off with Hydrogen, Helium, and not much ...


Jul 5, 2013 ... Practically all of these heavy elements were formed in generations of stars: ... the Universe was made out of about 92% hydrogen atoms and 8% helium atoms ... and why didn't more of the Universe become helium than it did?

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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, ...

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,  ...

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 ...