21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 24.4, Problem 24.4CYU
To determine
The evaluation of Drake equation by the astronomers.
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Which of the following scientists have contributions relating to intelligent alien life-forms?
Cannon and Hubble
Drake and Sagan
Hawking and Copernicus
Kaku and Kepler
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.)
The Drake Equation is a tool for estimating ...
A)
the number of alien civilizations that have visited the Earth in the past
B)
the number of planets in the Milky Way that contain civilizations intelligent enough to communicate through space.
C)
the number of habitable planets in the Milky Way where life has developed
Chapter 24 Solutions
21st Century Astronomy
Ch. 24.1 - Prob. 24.1CYUCh. 24.2 - Prob. 24.2CYUCh. 24.3 - Prob. 24.3ACYUCh. 24.3 - Prob. 24.3BCYUCh. 24.4 - Prob. 24.4CYUCh. 24 - Prob. 1QPCh. 24 - Prob. 2QPCh. 24 - Prob. 3QPCh. 24 - Prob. 4QPCh. 24 - Prob. 5QP
Ch. 24 - Prob. 6QPCh. 24 - Prob. 7QPCh. 24 - Prob. 8QPCh. 24 - Prob. 9QPCh. 24 - Prob. 10QPCh. 24 - Prob. 11QPCh. 24 - Prob. 12QPCh. 24 - Prob. 13QPCh. 24 - Prob. 14QPCh. 24 - Prob. 15QPCh. 24 - Prob. 16QPCh. 24 - Prob. 17QPCh. 24 - Prob. 18QPCh. 24 - Prob. 20QPCh. 24 - Prob. 21QPCh. 24 - Prob. 22QPCh. 24 - Prob. 23QPCh. 24 - Prob. 24QPCh. 24 - Prob. 25QPCh. 24 - Prob. 26QPCh. 24 - Prob. 27QPCh. 24 - Prob. 29QPCh. 24 - Prob. 30QP
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- Suppose 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_forwardWhat are some answers to the Fermi paradox? Can you think of some that are not discussed in this chapter?arrow_forwardSuppose no stars more massive than about 2 MSunhad ever formed. Would life as we know it have been able to develop? Why or why not?arrow_forward
- What would the universe look like if there was complete cemetery between matter and antimatter?arrow_forwardWhat evidence can you give that we live in a galaxy?arrow_forwardCalculate the frequency in megahertz (MHz) of the neutral hydrogen forbidden line that has an exact wavelength of 21.12 cm. Is that in the very high frequency (VHF) band from 30 to 300 MHz that includes FM radio, or in the ultra-high frequency (UHF) band from 300 to 3000 MHz that includes most TV broadcasts? (Hint: Refer to the relationship among wave speed, frequency, and wavelength, Chapter 6). (Notes: The speed of light is 3.00 1010 cm/s; 1 MHz = 1 106 Hz.)arrow_forward
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