21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 23, Problem 12QP
To determine
The false statement about the Dark ages of the universe.
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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.
Scientific models are often built in stages or layers, starting with a single idea. Which idea eventually grew into the big bang model of the universe?
What possible evidence do we have for the existence of "dark energy"?
a. It blocks our view of distant parts of the universe
b. The universe contains more light than has ever been emitted by stars.
c. Expansion seems to be accelerating
d. We see the cosmic background radiation in all directions
e. All of the above
Chapter 23 Solutions
21st Century Astronomy
Ch. 23.1 - Prob. 23.1CYUCh. 23.2 - Prob. 23.2CYUCh. 23.3 - Prob. 23.3CYUCh. 23.4 - Prob. 23.4CYUCh. 23 - Prob. 1QPCh. 23 - Prob. 2QPCh. 23 - Prob. 3QPCh. 23 - Prob. 4QPCh. 23 - Prob. 5QPCh. 23 - Prob. 6QP
Ch. 23 - Prob. 7QPCh. 23 - Prob. 8QPCh. 23 - Prob. 9QPCh. 23 - Prob. 10QPCh. 23 - Prob. 11QPCh. 23 - Prob. 12QPCh. 23 - Prob. 13QPCh. 23 - Prob. 14QPCh. 23 - Prob. 15QPCh. 23 - Prob. 16QPCh. 23 - Prob. 17QPCh. 23 - Prob. 18QPCh. 23 - Prob. 19QPCh. 23 - Prob. 20QPCh. 23 - Prob. 21QPCh. 23 - Prob. 22QPCh. 23 - Prob. 23QPCh. 23 - Prob. 24QPCh. 23 - Prob. 25QPCh. 23 - Prob. 26QPCh. 23 - Prob. 27QPCh. 23 - Prob. 28QPCh. 23 - Prob. 29QPCh. 23 - Prob. 30QPCh. 23 - Prob. 31QPCh. 23 - Prob. 32QPCh. 23 - Prob. 33QPCh. 23 - Prob. 36QPCh. 23 - Prob. 37QPCh. 23 - Prob. 38QPCh. 23 - Prob. 45QP
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- Construct a timeline for the universe and indicate when various significant events occurred, from the beginning of the expansion to the formation of the Sun to the appearance of humans on Earth.arrow_forwardWhat evidence shows that the Universe is expanding? What evidence shows that the Universe began with a Big Bang?arrow_forwardSince 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_forward
- 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. Values: n = 1*10^80arrow_forwardAssume 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*1080arrow_forwardThe history of the universe described by the Big Bang theory is separated into different eras. During which era was the predominant temperature of the Universe about 1 million Kelvin?a.The Plank Erab.The GUT Erac.The Electroweak Erad.The Era of Nucleie.The Era of AtomsSome planets have very strong magnetic fields. What features must a planet have to cause this?a.both rapid rotation and a conducting liquid coreb.only a rapid rotationc.only a liquid conducting cored.both a rapid rotation and a solid metallic coree.only a metallic corearrow_forward
- 21. Which of the following represents the notion that our observable Universe may be a part of a much larger whole? a. Big Bang Nucleosynthesis. b. Solar System. c. Galaxy. d. Multiverse.arrow_forwardhow everything in the universe come to exist? list the different theories on the origin of the universe and the origin of the solar system please help need ASAParrow_forwardDescribe at least two characteristics of the universe that are explained by the standard Big Bang model.arrow_forward
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