WebMar 15, 2024 · About 400 million years after the Big Bang, the universe began to emerge from the cosmic dark ages during the epoch of … In physical cosmology, Big Bang nucleosynthesis (abbreviated BBN, also known as primordial nucleosynthesis) is the production of nuclei other than those of the lightest isotope of hydrogen (hydrogen-1, H, 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 in the interval from roughly 10 seconds to 20 minutes after the Big Bang, and is calculated to be responsible fo…
Big Bang Nucleosynthesis - University of California, Berkeley
WebThe Era of Nuclei happens after the Era of Nucleosynthesis. The timeline of this epoch is between 3 minutes and 500,000 years after the Big Bang. In these 500,000 years, nuclei fusion has ended, and the size of the Universe has significantly increased. In these 500,000 years, the Universe was too hot for particles to form neutral atoms. The recombination epoch begins at around 18,000 years, as electrons are combining with helium nuclei to form He+ . At around 47,000 years, [2] as the universe cools, its behavior begins to be dominated by matter rather than radiation. At around 100,000 years, after the neutral helium atoms form, helium hydride is the … See more The chronology of the universe describes the history and future of the universe according to Big Bang cosmology. Research published in 2015 estimates the earliest stages of the universe's existence as taking place 13.8 See more The Standard Model of cosmology is based on a model of spacetime called the Friedmann–Lemaître–Robertson–Walker (FLRW) metric. A metric provides a measure of distance between objects, and the FLRW metric is the exact solution of Einstein field equations See more After cosmic inflation ends, the universe is filled with a hot quark–gluon plasma, the remains of reheating. From this point onwards the … See more The universe has appeared much the same as it does now, for many billions of years. It will continue to look similar for many more billions of years into the future. Based upon the … See more Chronology in five stages For the purposes of this summary, it is convenient to divide the chronology of the universe since it See more During the earliest moments of cosmic time, the energies and conditions were so extreme that current knowledge can only suggest possibilities, which may turn out to be incorrect. To … See more 370 thousand to about 1 billion years after the Big Bang Dark Ages After recombination and decoupling, the universe was transparent and had cooled enough to allow light to travel long distances, but there … See more mcc five 20
Origin of the Elements - Lawrence Berkeley National Laboratory
WebAug 7, 2024 · Quark Epoch: Shortly after the electroweak epoch until 10 -6 s, that is in most of latter part of the first millionth of a second, two types of leptons, electrons and neutrinos, were formed as the temperature … WebAug 9, 2000 · This process was similar to the way steam condenses to liquid droplets as water vapor cools. Further expansion and cooling allowed the neutrons and some of the protons to fuse to helium nuclei. The 73% hydrogen and 25% helium abundances that exists throughout the universe today comes from that condensation period during the … http://zebu.uoregon.edu/1999/ph123/lec06.html mcc first day of classes