Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Question
Chapter 25, Problem 55Q
To determine
Whether there can be other universes, regions of space and time that are not connected to the one in which we are living. Also, determine whether astronomers should be concerned about their existence or not.
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What is the speed of light? Is it constant all over the universe?
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
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*10^80
Chapter 25 Solutions
Universe
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- If all distant galaxies are expanding away from us, does this mean we’re at the center of the universe?arrow_forwardDescribe some possible futures for the universe that scientists have come up with. What property of the universe determines which of these possibilities is the correct one?arrow_forwardIn which type of model universe is space-time infinite in extent and positively curved? List all possibilities.arrow_forward
- In which type of model universe is space-time infinite in extent and open? List all possibilities.arrow_forwardWhat is the fate of a closed universe? In what case would that not be true?arrow_forwardWhat is dark energy and what evidence do astronomers have that it is an important component of the universe?arrow_forward
- The anthropic principle suggests that in some sense we are observing a special kind of universe; if the universe were different, we could never have come to exist. Comment on how this fits with the Copernican tradition described in Exercise 29.19.arrow_forwardConstruct 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_forwardIf general relativity offers the best description of what happens in the presence of gravity, why do physicists still make use of Newton’s equations in describing gravitational forces on Earth (when building a bridge, for example)?arrow_forward
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