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The Milky Way, Schroedinger`s Cat, and You
The Milky Way, Schroedinger`s Cat, and You

... A rapid and dramatic phase of expansion shortly after the Big Bang blows up these quantum fluctuations and “freezes” them into the fabric of the Universe. These are the seeds of cosmic structure. ...
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... 108 yr). In principle, if the production rates of these radioactive nuclides are known, the measurements of their extinct radioactivity in meteorites can have them serve as chronometers for the astrophysical p-process and for supernovae nucleosynthesis. Of these p-process chronometers, 146Sm is the ...
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slides - CAASTRO

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< 1 ... 16 17 18 19 20 21 22 23 24 ... 44 >

Big Bang nucleosynthesis

In physical cosmology, Big Bang nucleosynthesis (abbreviated BBN, also known as primordial nucleosynthesis) refers to the production of nuclei other than those of the lightest isotope of hydrogen (hydrogen-1, 1H, having a single proton as a nucleus) during the early phases of the universe. Primordial nucleosynthesis is believed by most cosmologists to have taken place from 10 seconds to 20 minutes after the Big Bang, and is calculated to be responsible for the formation of most of the universe's helium as the isotope helium-4 (4He), along with small amounts of the hydrogen isotope deuterium (2H or D), the helium isotope helium-3 (3He), and a very small amount of the lithium isotope lithium-7 (7Li). In addition to these stable nuclei, two unstable or radioactive isotopes were also produced: the heavy hydrogen isotope tritium (3H or T); and the beryllium isotope beryllium-7 (7Be); but these unstable isotopes later decayed into 3He and 7Li, as above.Essentially all of the elements that are heavier than lithium and beryllium were created much later, by stellar nucleosynthesis in evolving and exploding stars.
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