Nuclear fusion formed the first of the nuclei we know about today – Hydrogen and Helium – in proportions that proved necessary for the universe … The Big Bang is therefore more like a "white hole": the time-reversed version of a black hole. Image credit: NASA / Lynette Cook. My question is not concerned with what came before what we're calling "the beginning".

The Big Bang is commonly thought of as the start of it all: About 13.8 billion years ago, the observable universe went boom and expanded into being.. First hints are emerging of a universe that existed before our own: an alien world of chaos where time, space and geometry were yet to form 9. The observable universe was indeed much smaller near the time of the Big Bang, compared to its radius now. Why the big bang was not the beginning. The First Stars in the Universe Exceptionally massive and bright, the earliest stars changed the course of cosmic history By Richard B. Larson , Volker Bromm on January 19, 2009 Figure 3 shows how the temperature changes with the passage of time. Three basic ideas hold the key to tracing the changes that occurred during the time just after the universe began. I think the general answer is a point, but why? As the age of the universe moved beyond seconds to minutes, it grew in size to about 10 15 kilometres across. This was the moment of first light in the universe, between 240,000 and 300,000 years after the Big Bang, known as the Era of Recombination. Dogs and cats lived together. The first few minutes. The first clear difference is that the Big Bang singularity of the FRW models lies in the past of all events in the universe, whereas the singularity of a black hole lies in the future. The temperature of the cosmic microwave background c. The uniformity, with small fluctuations, of the cosmic microwave background d. The abundance of lithium in the universe e. Nuclear fusion formed the first of the nuclei we know about today – Hydrogen and Helium – in proportions that proved necessary for the universe as we know it to form. But the Universe didn’t start off with these heavier elements at all.

a. Rather, the universe, and time itself, had a beginning in the Big Bang, about 15 billion years ago. The first clear difference is that the Big Bang singularity of the FRW models lies in the past of all events in the universe, whereas the singularity of a black hole lies in the future. The conclusion of this lecture is that the universe has not existed forever. At the very beginning of the Universe, seconds after the Big Bang, everything was mushed together. Which of the following is not observational evidence in support of the Big Bang Theory? The beginning of real time, would have been a singularity, at which the laws of physics would have broken down. The first time that photons could rest for a … Why not start with something 100 LY across, for example? The first few minutes. "That's big, but actually more tightly constrained that many other models," according to MIT Technology Review, which first reported the 2011 story. r/space: Share & discuss informative content on: * Astrophysics * Cosmology * Space Exploration * Planetary Science * Astrobiology Let’s start with the first few minutes following the Big Bang. The relative abundance of helium to hydrogen in the universe b. The first, as we have already mentioned, is that the universe cools as it expands. Diagram by NASA, via SNAP. As the age of the universe moved beyond seconds to minutes, it grew in size to about 10 15 kilometres across. In response to the inaccuracy of considering only general relativity, as in the traditional model of the Big Bang, alternative theoretical formulations for the beginning of the Universe have been proposed, including a string theory-based model in which two branes, enormous membranes much larger than the Universe, collided, creating mass and energy. What was the size of the universe at the big bang and why do we think so? Energy and matter were the same thing.

The Big Bang is therefore more like a "white hole": the time-reversed version of a black hole. Diagram by NASA, via SNAP. Based on the study, astronomers have updated the timeline of the universe to reflect when the first stars are now thought to have appeared, some 180 million years after the Big Bang.

This is because its radius actually depends on our Universe's scale factor*, which means that at the moment GR predicts the scale factor to be zero, it also predicts the size of the observable universe … ANSWER TO FIRST QUESTION According to standard Big Bang models, the universe started from a 'singularity' — an infinitely dense, infinitely hot and, classically speaking [1], infinitesimally small point.

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