UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
11th Edition
ISBN: 9781319278670
Author: Freedman
Publisher: MAC HIGHER
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Question
Chapter 27, Problem 22Q
To determine
The response of the society to the discovery of intelligent messages received from a different civilization, on a planet revolving around another star.
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The Search for Extraterrestrial Intelligence (SETI) makes use of a huge, multi-billion-dollar network of radio telescopes around the world, all built solely for the purpose of contacting alien civilizations.
True
False
A radio broadcast left Earth in 1911. 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 0.50 and that, in a given planetary system, the average number of planets that have orbited in the habitable zone for 4 billion years is 0.20. How many possible planets with life could have heard this signal?
Chapter 27 Solutions
UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
Ch. 27 - Prob. 1CCCh. 27 - Prob. 2CCCh. 27 - Prob. 3CCCh. 27 - Prob. 4CCCh. 27 - Prob. 5CCCh. 27 - Prob. 6CCCh. 27 - Prob. 7CCCh. 27 - Prob. 8CCCh. 27 - Prob. 9CCCh. 27 - Prob. 10CC
Ch. 27 - Prob. 11CCCh. 27 - Prob. 12CCCh. 27 - Prob. 13CCCh. 27 - Prob. 14CCCh. 27 - Prob. 1CLCCh. 27 - Prob. 1QCh. 27 - Prob. 2QCh. 27 - Prob. 3QCh. 27 - Prob. 4QCh. 27 - Prob. 5QCh. 27 - Prob. 6QCh. 27 - Prob. 7QCh. 27 - Prob. 8QCh. 27 - Prob. 9QCh. 27 - Prob. 10QCh. 27 - Prob. 11QCh. 27 - Prob. 12QCh. 27 - Prob. 13QCh. 27 - Prob. 14QCh. 27 - Prob. 15QCh. 27 - Prob. 16QCh. 27 - Prob. 17QCh. 27 - Prob. 18QCh. 27 - Prob. 19QCh. 27 - Prob. 20QCh. 27 - Prob. 21QCh. 27 - Prob. 22QCh. 27 - Prob. 23QCh. 27 - Prob. 24QCh. 27 - Prob. 25QCh. 27 - Prob. 26QCh. 27 - Prob. 27QCh. 27 - Prob. 28QCh. 27 - Prob. 29QCh. 27 - Prob. 30QCh. 27 - Prob. 31QCh. 27 - Prob. 32QCh. 27 - Prob. 34QCh. 27 - Prob. 35Q
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- Why are we limited to finding life on planets orbiting other stars to situations where the biosphere has created planet-scale changes?arrow_forwardWhat are some reasons that more advanced civilizations might want to send out messages to other star systems?arrow_forwardSuppose astronomers discover a radio message from a civilization whose planet orbits a star 35 lightyears away. Their message encourages us to send a radio answer, which we decide to do. Suppose our governing bodies take 2 years to decide whether and how to answer. When our answer arrives there, their governing bodies also take two of our years to frame an answer to us. How long after we get their first message can we hope to get their reply to ours? (A question for further thinking: Once communication gets going, should we continue to wait for a reply before we send the next message?)arrow_forward
- If we do find life on Mars, what might be some ways to check whether it formed separately from Earth life, or whether exchanges of material between the two planets meant that the two forms of life have a common origin?arrow_forwardWhy is traveling between the stars (by creatures like us) difficult?arrow_forwardWhat is the difference between chemical evolution and biological evolution?arrow_forward
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