WebApr 12, 2024 · We explore the effect of neutron lifetime and its uncertainty on standard big bang nucleosynthesis (BBN). BBN describes the cosmic production of the light nuclides, 1H, D, 3H+3He, 4He, and 7Li+7Be, in the first minutes of cosmic time. The neutron mean life τn has two roles in modern BBN calculations: (1) it normalizes the matrix element for … WebSee Answer. Question: Where did the elements heavier than hydrogen and helium come from? Points: 0.7 They were produced in the Big Bang. They evolved from hydrogen and helium shortly after the Big Bang. They were produced inside stars. They were produced inside dense interstellar gas. all of the mentioned choices.
What Is the Big Bang? NASA Space Place – NASA …
WebMany cosmologists think its origin lies in so-called quantum uncertainty, which is known to allow energy to emerge literally from nowhere. What isn’t clear, however, is why this cosmic energy persisted long enough to drive the Big Bang. Read more: Who really discovered the heat from the Big Bang? react native ios bluetooth
Why did the Big Bang produce hydrogen? - Physics Stack Exchange
Web380,000 years after the Big Bang - The temperature of the universe had cooled to about 3000 K. Electrons began to combine with hydrogen and helium nuclei. High energy photons from this period rushed outwards. The early universe was so hot, that as it has expanded and cooled, the highly energetic photons from that time have had their wavelengths ... WebApr 17, 2024 · Scientists believe that around 100,000 years after the big bang, helium and hydrogen combined to make a molecule called helium hydride for the first time. Helium hydride should be present in some parts of the modern universe, but it has never been detected in space — until now. WebNov 20, 2024 · Perhaps "not significant" is too strong to be applied to helium sysnthesis in the big bang. @dmckee at the start of BBN the ratio of protons to neutrons was ~7:1. Of a given 14 protons and 2 neutrons, 2 of each end up as one helium atom, leaving 12 protons. The He/H ratio is therefore 1:12 (7.7%) by number of atoms, or 4:12 (approx) (~25%) by … react native ios apple pay