EBK UNDERSTANDING OUR UNIVERSE (THIRD E
3rd Edition
ISBN: 9780393631760
Author: Blumenthal
Publisher: VST
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Chapter 1, Problem 12QAP
To determine
Significance of the scientific revolution.
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What are a couple of scientific speculations that describe the future of our universe?
Your friends are talking about Olber's Paradox:
Friend 1: When the universe was quite young, it was also quite small, and therefore light
was trapped inside the universe. This is why we don't see light from the edge of the
universe in every direction.
Friend 2: No, Olber's Paradox describes only light from stars, not from galaxies, and why
you can't use light from distant stars to see at night.
Friend 3: You're both right and you're both wrong. The paradox concerns itself with the
expansion of the universe, and explains why light from the early universe was able to be
released.
Are any of them right, in part or in whole?
Assume the observable Universe is charge neutral, and that it contains n nuclei (hydrogen plus helium nuclei, ignoring other elements). Take the helium mass fraction as 1/4. How many electrons are there in the observable Universe? Enter your answer in scientific notation with one decimal place.
Value: n = 4*1080
Chapter 1 Solutions
EBK UNDERSTANDING OUR UNIVERSE (THIRD E
Ch. 1.1 - Prob. 1.1CYUCh. 1.2 - Prob. 1.2CYUCh. 1.3 - Prob. 1.3CYUCh. 1 - Prob. 1QAPCh. 1 - Prob. 2QAPCh. 1 - Prob. 3QAPCh. 1 - Prob. 4QAPCh. 1 - Prob. 5QAPCh. 1 - Prob. 6QAPCh. 1 - Prob. 7QAP
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- Since the time of Copernicus, each revolution in astronomy has moved humans farther from the center of the universe. Now it appears that we may not even be made of the most common form of matter. Trace the changes in scientific thought about the central nature of Earth, the Sun, and our Galaxy on a cosmic scale. Explain how the notion that most of the universe is made of dark matter continues this “Copernican tradition.”arrow_forwardWhat evidence shows that the Universe is expanding? What evidence shows that the Universe began with a Big Bang?arrow_forwardConsider three cosmological perspectives-the geocentric perspective, the heliocentric perspective, and the modern perspective-in which the Sun is a minor star on the outskirts of one galaxy among billions. Discuss some of the cultural and philosophical implications of each point of view.arrow_forward
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- The Analysis of the Big Bang Theory.arrow_forwardPlace all of the following in order from earliest to the most recent: Dark energy begins acceleration of the expansion of the universe You study for your final in astronomy Last scattering of the Cosmic Microwave Background Radiation First stars and galaxies form Big Bang Universe becomes transparent (no longer opaque) aka photon decoupling time Inflationary Epoch Formation of first complex elements (hydrogen isotopes, helium & lithium)arrow_forwardCompare the values of the number of grains of sand in all earth’s beaches with the number of stars in the universe – which is greater? Number of sand grains Number of stars They are about the same.arrow_forward
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