What are the basic stages in the Sun's history? This cosmic background radiation image (bottom) is an all-sky map of the CMB as observed by the Planck mission. Chapter 23, Sorting Task: First Five Minutes. Select the statement which does not identify a legitimate objection to this claim. Which of the following statements correctly summarizes the events in the early universe according to the Big Bang theory? Which event in the history of the universe happened last? It is called cosmic microwave background radiation. Hydrogen, helium and trace amounts of Lithium, beryllium, and boron. the Andromeda galaxy. During the first fraction of a second, the forces separated and there was a brief but important episode of inflation. It contains prominent spectral lines of hydrogen, the primary chemical ingredient of the universe. Which of the following statements explains why the night sky is dark? Why? To ensure the best experience, please update your browser. The density of the universe became too low. According the the BBT, how many forces - and which ones - operated in the universe during the GUT era? Why does the Big Bang theory predicts that the cosmic background radiation should have a perfect thermal radiation spectrum? The Big Bang theory seems to explain how elements were formed during the first few minutes after the Big Bang. More than 50 million students study for free with the Quizlet app each month. What direct evidence do we have that the weekend electromagnetic forces were once unified as a single force? What is postulated to have caused a set inflation of the early universe? Why is the nucleosynthesis era so important in determining the chemical composition of the universe? "The cmB [cosmic microwave background] is the relic radiation from the 'moment' of first transparency, 4 × 10 5 years after the Big Bang, when the opaque plasma pervading the cosmos finally became cool enough (about 3000 K) to let neutral hydrogen survive. CMB stands for Cosmic Microwave Background. It is the result of a mixture of radiation from many independent sources, such as stars and galaxies that formed within the first billion years of the big bang. Lab experiments conducted with particle accelerators confirm predictions made by the theory that unifies ____. An enormous amount of energy was released when the strong and electroweak forces froze out from the GUT force. The fact that the temperature of the cosmic microwave background is almost the same everywhere. Cosmic microwave background - Cosmic microwave background - Isotropy in the cosmic background: Apart from the small fluctuations discussed above (one part in 100,000), the observed cosmic microwave background radiation exhibits a high degree of isotropy, a zeroth order fact that presents both satisfaction and difficulty for a comprehensive theory. Ungraded . One 10 billionth of a second after the Big Bang. After about 50,000 years, the density of matter exceeded the density of radiation for the first time, eventually dominating the universe. fusion. Cosmic Microwave Background Quizlet is the easiest way to study, practice and master what you’re learning. (note that the helium abundance is defined as the mass of helium relative to the mass of hydrogen.) November 1, 2004 Erik M. Leitch of the University of Chicago explains. d. Main Sequence star . 11. Description: 2 forces: Gravity and a single force that later became the strong, weak, and electromagnetic forces. Review on Chapters 11, 13, & 14 for Dr. Koerner's class at NAU. Which of the following statements best explains what we mean when we say that the electroweak and strong forces "froze out" at 10^-38 second after the Big Bang? Before that time, the gas in the universe was dense and ionized and therefore did not allow light to travel freely. Cosmic background radiation is electromagnetic radiation from the Big Bang.The origin of this radiation depends on the region of the spectrum that is observed. The idea that all matter and energy in the universe began in and unimaginably dense state, and then space itself began expanding. The combined mass of the two particles is completely transformed into energy. Scientists are not allowed to believe in God. 4. In the particle era, particles of matter outnumbered particles of antimatter by about one particle in 1 billion. Cosmic microwave background (CMB), also called cosmic background radiation, electromagnetic radiation filling the universe that is a residual effect of the big bang 13.8 billion years ago. Faint ripples in the cosmic microwave background radiation as seen mapped on a full-sky projection. Rank these times based on the wavelength of the Peak intensity of the cosmic background radiation at those times, from shortest to longest. The observed composition of ordinary matter in the universe roughly 75% hydrogen and 25% helium by mass closely matches the theoretical predictions based on the Big Bang model, If inflation really occurred in our observable universe is only a tiny portion of the entire universe born in the Big Bang. Most of the particles annihilated to make photons, but some became protons, neutrons, electrons, and neutrinos. Create your own flashcards or choose from millions created by other students. These topics—the Big Bang, inflation, the phase changes, the cosmic microwave background—are all pretty mind-blowing. To ensure the best experience, please update your browser. Classify each statement below as an observation or as an inference based on the current Big Bang model. a. We work backward from current conditions to calculate what temperature and densities must have been when the observable universe was much smaller in size. 2. Which hypothetical observation below would call our current theory into question? The cosmic background radiation in the helium content of the universe. Report an issue . The anisotropy of the cosmic microwave background on different angular scales can also be used to study reionization. Colors represent tiny temperature deviations … First there was the Big Bang and then inflation which caused recession. The spectrum of the cosmic microwave background as measured by the COBE satellite fit a blackbody spectrum at a temperature of 2.73K. 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