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6. During the first few minutes after the Big Bang, the universe was opaque. Light could not go through it. Why? 4. How does the Cosmic Microwave Background Radiation (CMBR) mark an important milestone in the early history of the universe? A. All the photons were being absorbed. A. The CMBR originated as the first visible light. It marks time when the universe transitioned from opaque to transparent. B. There was nothing to produce photons. C. The photons were attracted to other particles. B. The CMBR originated from the initial force that triggered the Big Bang. It is the remnant energy from the previous universe. D. The mix of particles was so dense that photons could not get through. 7. What determined the temperature, density, C. The CMBR originated when the first massive stars in the universe began exploding as supernovas shortly after the Big Bang. and ratio of hydrogen to helium of the universe soon after the Big Bang? A. the rate at which the universe expanded D. The CMBR originated as the first B. the rate of nuclear fusion in the first stars microwave radiation. It marks the time the universe first became energic enough to produce microwaves. C. the density of the material the universe was expanding into D. the timing of the transition from an opaque to a transparent universe 5. When did the universe begin? A. 1 billion years ago B. 10 million years ago C. 14 billion years ago D. 50 billion years ago Read each statement. Write your answer on the lines. 8. A classmate named Brandon is arguing that if the universe had expanded more slowly than it did, the transition from an opaque to a transparent universe would have happened sooner than it actually did. How would you explain to Brandon, using the formation of the first elements in the universe, that he is wrong?
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Transcribed Image Text:6. During the first few minutes after the Big Bang, the universe was opaque. Light could not go through it. Why? 4. How does the Cosmic Microwave Background Radiation (CMBR) mark an important milestone in the early history of the universe? A. All the photons were being absorbed. A. The CMBR originated as the first visible light. It marks time when the universe transitioned from opaque to transparent. B. There was nothing to produce photons. C. The photons were attracted to other particles. B. The CMBR originated from the initial force that triggered the Big Bang. It is the remnant energy from the previous universe. D. The mix of particles was so dense that photons could not get through. 7. What determined the temperature, density, C. The CMBR originated when the first massive stars in the universe began exploding as supernovas shortly after the Big Bang. and ratio of hydrogen to helium of the universe soon after the Big Bang? A. the rate at which the universe expanded D. The CMBR originated as the first B. the rate of nuclear fusion in the first stars microwave radiation. It marks the time the universe first became energic enough to produce microwaves. C. the density of the material the universe was expanding into D. the timing of the transition from an opaque to a transparent universe 5. When did the universe begin? A. 1 billion years ago B. 10 million years ago C. 14 billion years ago D. 50 billion years ago Read each statement. Write your answer on the lines. 8. A classmate named Brandon is arguing that if the universe had expanded more slowly than it did, the transition from an opaque to a transparent universe would have happened sooner than it actually did. How would you explain to Brandon, using the formation of the first elements in the universe, that he is wrong?
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