Astronomy Today (9th Edition)
9th Edition
ISBN: 9780134450278
Author: Eric Chaisson, Steve McMillan
Publisher: PEARSON
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Chapter 3, Problem 7D
To determine
The change in experience of the Universe for an observer on Earth for the cases when the
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Is it possible in principle for a human being who has a life expectancy of 70 years to make a round-trip journey to a part of the universe thousands of light-years distant? Explain.
When we look out into the universe, we see into the past. John Dobson, founder of the San Francisco Sidewalk Astronomers, says that we cannot even see the backs of our own hands now—in fact, we can’t see anything now. Do you agree? Explain.
The special theory of relativity has what effect on measurements done today? (a) None whatsoever, because any correction would be negligible. (b) We need to consider the effects of relativity when objects move close to the speed of light. (c) We should always make a correction for relativity because Newton’s laws are basically wrong. (d) It doesn’t matter, because we can’t make measurements where relativity would matter.
Chapter 3 Solutions
Astronomy Today (9th Edition)
Ch. 3 - Prob. 1DCh. 3 - Prob. 2DCh. 3 - Prob. 3DCh. 3 - Prob. 4DCh. 3 - Prob. 5DCh. 3 - Prob. 6DCh. 3 - Prob. 7DCh. 3 - Prob. 8DCh. 3 - Prob. 9DCh. 3 - Prob. 10D
Ch. 3 - Prob. 11DCh. 3 - Prob. 12DCh. 3 - Prob. 13DCh. 3 - Prob. 14DCh. 3 - Prob. 15DCh. 3 - Prob. 1MCCh. 3 - Prob. 2MCCh. 3 - Prob. 3MCCh. 3 - Prob. 4MCCh. 3 - Prob. 5MCCh. 3 - Prob. 6MCCh. 3 - Prob. 7MCCh. 3 - Prob. 8MCCh. 3 - Prob. 9MCCh. 3 - Prob. 10MCCh. 3 - Prob. 1PCh. 3 - Prob. 2PCh. 3 - Prob. 3PCh. 3 - Prob. 4PCh. 3 - Prob. 5PCh. 3 - Prob. 6PCh. 3 - Prob. 7PCh. 3 - Prob. 8P
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- If 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_forwardWhen we speak of time dilation, do we mean that time passes more slowly in moving systems or that it simply appears to do so?arrow_forwardExplain why the speed of light is the maximum attainable speed in the universe ?arrow_forward
- Under what condition will you and a friend share the same realm of spacetime? When will you not share the same realm?arrow_forwardChoose the BEST answer to the following: Relativity equations for time, length, and momentum hold true for (a) everyday low speeds. (b) relativistic speeds. (c) Both of these. (d) Neither of these.arrow_forwardGeneral relativity predicts that (a) light leaving the Sun is slowed by gravity. (b) light passing the Sun is deflected. (c) a clock on the Sun’s surface runs faster than on Earth. (d) All of these.arrow_forward
- So if our universe is about 15 billion years old. Do we think this because we can't see farther away in the distance or is there no light source past that distance?arrow_forwardTrue or False: People traveling near the speed of light relative to Earth would measure their lifespans and find them, on the average, longer than the average human lifespan as measured on Earth.arrow_forwardPlease explain with a spacetime diagram!arrow_forward
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