UNIVERSE LL W/SAPLINGPLUS MULTI SEMESTER
11th Edition
ISBN: 9781319278670
Author: Freedman
Publisher: MAC HIGHER
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Chapter 27, Problem 25Q
(a)
To determine
The frequency of the
(b)
To determine
The merits of the suggestion provided in the answer of the above part (a).
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Most of the stars we can see with the unaided eye in our night sky are hundreds or even thousands of lightyears away from Earth. (The very closest ones are only a few dozen lightyears away, but most are much further.) The vast majority of stars in our galaxy are many tens of thousands of lightyears away. IF intelligent life existed on planets orbiting some of these stars – and that’s a huge IF! – comment on the likelihood and practicality of (a) visiting, (b) communicating with, or (c) verifying the existence of those life forms. Describe how you might go about approaching EACH of these three tasks, or if you think they are even possible. (One or two sentences for each part would be appropriate.)
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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 is traveling between the stars (by creatures like us) difficult?arrow_forwardWould a human have been possible during the first generation of stars that formed right after the Big Bang? Why or why not?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
- Why couldnt atomic nuclei exist when the Universe was less than about 2 minutes old?arrow_forwardLooking at the speed-time graphs of the four aliens, who shows the greatest rate of speeding up?arrow_forwardDo binary stars (double-star systems that orbit about a common center of mass) radiate gravitational waves? Why or why not?arrow_forward
- In the Benchmark Model, what is the total mass of all the matter within the current Hubble Radius (Length)? Values: Assume H0=70 km/s/Mpc Ωm,0=0.3 Your answer must be in units of Solar Masses and in scientific notation and include one decimal place (2 sig figs).arrow_forwardThe fictional starship Enterprise obtains its power bycombining matter and antimatter, achieving completeconversion of mass into energy. If the mass of theEnterprise is approximately 6 x10 9 kg how much massmust be converted into kinetic energy to accelerate it fromrest to one-tenth the speed of light?arrow_forwardSuppose a spaceship has the mass of a typical ocean cruise ship, then it can be assumed that it has a mass of 4.3 x 108kg. Consider the Kendrick energy required at 17% of the speed of light. If energy to get a spaceship to cruising speed is generated using matter-antimatter annihilation, what mass of antimatter in kg is required ?arrow_forward
- In accordance with Einstein’s theory of relativity, calculate the mass of the matter needed to be destroyed to produce an energy of 1.75×10^15 W-hr.arrow_forwardFrom Einstein’s mass-energy relations, the energy is convertedinto mass and vice versa.arrow_forwardWhy does the Drake equation implicitly assume the Copernican Principle?arrow_forward
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