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. Ungraded . Which of the following statements about the cosmic background radiation is not true? The first spacecraft, launched in 1989, is NASA’s Cosmic Background Explorer, or COBE. What happens when a particle of matter meets its corresponding anti-particle of antimatter? Which of the following statements correctly summarizes the events in the early universe according to the Big Bang theory? The universe is at lease 20 billion years old. The overall structure of the universe is very uniform, but the universe must have contained some regions of higher density in order for galaxies to form. The cosmic microwave background radiation last interacted with matter when the universe was about _____ times its present size. Hydrogen, helium and trace amounts of Lithium, beryllium, and boron. Which event in the history of the universe happened last? These two forces first became distinct at this time. What is postulated to have caused a set inflation of the early universe? Quizlet is the easiest way to study, practice and master what you’re learning. Get ready for your Cosmic Microwave Background tests by reviewing key facts, theories, examples, synonyms and definitions with study sets created by students like you. One component is the cosmic microwave background.This component is redshifted photons that have freely streamed from an epoch when the Universe became transparent for the first time to radiation. It looks like your browser needs an update. Which of the following observations cannot be explained by the Big Bang theory unless we assume that an episode of inflation occurred? The four fundamental forces that operate in the universe today are ____. It is the result of a mixture of radiation from the many independent sources, such as stars and galaxies. the Andromeda galaxy. Sensitive observations have not revealed any variations in the temperature of the cosmic microwave background radiation, leading to major conflicts with theories of galaxy formation. Why? WMAP was launched in 2001, and Planck was launched in 2009. The combined mass of the two particles is completely transformed into energy (photons). November 1, 2004 Erik M. Leitch of the University of Chicago explains. In the past, the temperature of the universe was ____. It is all over the sky 2. 5. What direct evidence do we have that the weekend electromagnetic forces were once unified as a single force? They combined in groups to make protons, neutrons, into their anti-particles. the Doppler effect. which one is fictitious? Why can't current theorists describe what happened during the Planck era? Check out our new Cosmic Microwave Background study sets, and maximize your study time. According the the BBT, how many forces - and which ones - operated in the universe during the GUT era? 1. ! 30 seconds . The basic chemical composition of the universe had been determined. By the time stable helium nuclei had formed, the temperature and density had already dropped too low for helium fusion to occur. the Andromeda galaxy. 12. Before it, conditions were so extreme that our current understanding of physics is insufficient to predict what might have occurred. (2) the theory correctly predicts the observed overall chemical composition of the primeval universe. The principles of quantum mechanics required that the energy fields at any point in space be continually fluctuating. Create your own flashcards or choose from millions created by other students. 4. Olbers' paradox is an apparently simple question, but it's resolution suggests that the universe is finite in age. In the cosmic timeline for the universe starting at the Big Bang, we live in the Planck era. Review on Chapters 1-5 for Dr. Koerner's class at NAU. Creation science claims that scientific evidence can and does prove God made the universe. The cosmic microwave background (CMB) is thought to be leftover radiation from the Big Bang, or the time when the universe began. The universe began with the forces unified. What was the significance of the end of the era of nucleosynthesis, when the universe was about 5min old? Review on Chapters 11, 13, & 14 for Dr. Koerner's class at NAU. What happens when a particle of matter meets its corresponding antiparticle of antimatter? The Big Bang produced no elements heavier than helium because it was never hot enough for healing them to undergo fusion. A sudden and extremely rapid expansion of the universe that occurred in a tiny fraction of a second during the universes first second of existence. F 27. Four of the five statements below are real. What are the basic stages in the Sun's history? Why does the Big Bang theory predicts that the cosmic background radiation should have a perfect thermal radiation spectrum? The unification of three fundamental forces, the electromagnetic, the strong and the weak nuclear force, into a single grand force would be readily observable Based on our current understanding of physics, We can understand the conditions that prevailed in the early universe as far back in time as about ____. It looks like your browser needs an update. Which had density fluctuations first, normal matter or … The density of the universe became too low. What are they? The Cosmic Microwave Background (CMB, CMBR), in Big Bang cosmology, is electromagnetic radiation which is a remnant from an early stage of the universe, also known as "relic radiation" . An enormous amount of energy was released when the strong and electroweak forces froze out from the GUT force. c. Hydrogen fusion begins . The discovery of a galaxy with 10% helium abundance. During the first fraction of a second, the forces separated and there was a brief but important episode of inflation. If you look very closely, there are slight fluctuations from place to place ALL OF THE ABOVE!! The curvature is a quantity describing how the geometry of a space differs locally from the one of the flat space.The curvature of any locally isotropic space (and hence of a locally isotropic universe) falls into one of the three following cases: . Oh no! Start studying Chapter 12 - The Cosmic Microwave Background. If the theory of inflation is correct, then dark matter must make up about _____ percent of all matter in the universe. How does the idea of inflation account for the existence of the "seeds" of density from which galaxies and other large structures formed? Approximately how long did the nucleosynthesis era last? Which statement about the cosmic microwave background is NOT true? 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