Life in the Universe (4th Edition)
Life in the Universe (4th Edition)
4th Edition
ISBN: 9780134089089
Author: Jeffrey O. Bennett, Seth Shostak
Publisher: PEARSON
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Chapter 1, Problem 16TYU

Today, the research known as SETI is conducted primarily by (a) scanning the skies for signals from alien civilizations; (b) sending spacecraft to the planets; (c) using telescopes to observe extrasolar planets.

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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
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?
can you imagine life without electricity? what would you be our if there is no advancement in technology like motors and generators?
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