Cosmic Perspective Fundamentals
3rd Edition
ISBN: 9780134988504
Author: Bennett, Jeffrey O., Donahue, M. (megan), SCHNEIDER, Nicholas, Voit, Mark
Publisher: Pearson,
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Textbook Question
Chapter 15, Problem 7QQ
Choose the best answer to each of the following Explain your reasoning.
if we someday find little life on Mars, we expect to find it (a)near the polar ice caps,(b) in dried up river bed (c)underground
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Which of the following is least reasonable regarding the difficulty in contacting extraterrestrial life using space flight and radio communication.
Group of answer choices
Space flight to the nearest star would take thousands of years with current technology.
Even if another intelligent civilization is within a few hundred light-years of us, conversations would be very slow with a turnaround time of decades or even centuries.
The spacecraft that NASA sent to Proxima Centauri a few years ago should be approaching its target within a decade or two, depending on solar wind conditions.
Earth has been broadcasting at radio wavelengths since the 1930's, so any civilization within a radius of about 100 light-years or so could have received the broadcast by now.
Without some major breakthrough, interstellar space flight is totally impractical.
Which of the following is least reasonable regarding the concept of a habitable zone?
Group of answer choices
M-type stars have wider habitable zones than G-type stars.
It is a region around a star where liquid water could be found on a planet's surface.
The habitable zone of a less massive star would be closer to the star.
In the course of millions of years, our habitable zone will slowly shift from Earth to Mars.
The Galactic habitable zone cannot be too close to the Galactic center because the radiation from the bright stars and supernovae in the crowded inner part of the Galaxy would probably be detrimental to life.
Tutorial
A radio broadcast left Earth in 1925. How far in light years has it traveled?
If there is, on average, 1 star system per 400 cubic light years, how many star systems has this broadcast
reached?
Assume that the fraction of these star systems that have planets is 0.30 and that, in a given planetary
system, the average number of planets that have orbited in the habitable zone for 4 billion years is 0.85. How
many possible planets with life could have heard this signal?
Part 1 of 3
To figure out how many light years a signal has traveled we need to know how long since the signal left Earth.
If the signal left in 1925, distance in light years = time since broadcast left Earth.
d = tnow - tbroadcast
d =
light years
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Chapter 15 Solutions
Cosmic Perspective Fundamentals
Ch. 15 - Choose the best answer to etch of the following....Ch. 15 - Choose the best answer to etch of the following ....Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to each of the following...
Ch. 15 - Choose the best answer to each of the following...Ch. 15 - Choose the best answer to etch of the following....Ch. 15 - Explain all answers clearly, with complete...Ch. 15 - Explain all answers clearly, with complete...Ch. 15 - Explain all answers clearly, with complete...Ch. 15 - Explain all answers clearly, with complete...Ch. 15 - Explain all answers clearly, with complete...Ch. 15 - Prob. 18SEQCh. 15 - Explain all answers clearly, with complete...Ch. 15 - Prob. 20SEQCh. 15 - Explain all answers clearly, with complete...Ch. 15 - Explain all answers clearly, with complete...Ch. 15 - Explain all answers clearly, with complete...
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