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| 1 . |
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Based on our current understanding of physics, it would seem that we can understand the conditions that prevailed in the early universe as far back in time as ______. [Hint]
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| 2 . |
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What happens when a particle of matter meets its corresponding antiparticle of antimatter? [Hint]
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| 3 . |
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What is the significance of the Planck time? [Hint]
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| 4 . |
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The four fundamental forces that operate in the universe today are: [Hint]
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| 5 . |
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A "GUT" (grand unified theory) refers to theories that ______. [Hint]
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| 6 . |
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What do we mean by inflation? [Hint]
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| 7 . |
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Of the statements below, which one correctly summarizes the events in the early universe according to the Big Bang theory? [Hint]
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| 8 . |
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Which statement about the cosmic microwave background is NOT true? [Hint]
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| 9 . |
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The Big Bang theory is supported by two major lines of evidence that alternative models have not successfully explained. What are they? [Hint]
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| 10 . |
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Measuring the amount of deuterium in the universe allows us to set a limit on _______. [Hint]
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| 11 . |
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Based on the Big Bang theory, what do observations of the cosmic microwave background and of chemical abundances in the universe suggest about dark matter? [Hint]
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| 12 . |
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Which of the following observations cannot be explained by the Big Bang theory UNLESS we assume that an episode of inflation occurred? [Hint]
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| 13 . |
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The idea of inflation makes one clear prediction that, until quite recently, seemed to contradict the available observations. What is this prediction? [Hint]
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| 14 . |
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Olber's Paradox is an apparently simple question, but its resolution suggests that the universe is finite in age. What is the question? [Hint]
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Answer choices in this exercise are randomized and will appear in a different order each time the page is loaded.
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