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 11QQ
Choose the best answer to each of the following Explain your reasoning.
The theory of evolution is (a).a scientific theory that by extensive evidence.(b) one of several competing scientific models that all seem equally successful in exam explaining the nature of life on earth .(c).a speculative hypothesis about how life changes through time.
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Students have asked these similar questions
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.
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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Tutorial
A radio broadcast left Earth in 1923. 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 0.40.
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 1923, distance in light years =
time since broadcast left Earth.
d = tnow - broadcast
d = 97
97 light years
Part 2 of 3
Since the radio signal travels in all directions, it
expanded as a sphere with a radius equal to the
distance it has traveled so far. To determine the
number of star systems this signal has reached, we
need to determine the volume of that sphere.
V, =
Vb…
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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- 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?arrow_forwardGive a Claim and Evidence to each question.5. Is there a possibility that Physics in the context of Entropy help in the explanation of emergenceof life?arrow_forwardHow can we apply the principles of Charles Darwin's theory of evolution by natural selection in our everyday life?arrow_forward
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- 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.arrow_forwardWhich statement correctly describes evidence that supports the theory of evolutionarrow_forwardThe DNA in a single cell in your body contains about 4.5 billion base pairs. Imagine building a model of that DNA like a ladder with base pairs for rungs. If you make the rungs 1 inch apart, how long will the ladder be? Express your answer in miles.arrow_forward
- Put in order the organization levels for life: Organs→ - Organisms Populations :: Tissues :: Ecosystems : Organ systems : Cells : Communities 1 2 3 4 5 6 7 Support | Schoology Blog | PRIVACY POLIarrow_forwardWhich of the following statements about the "tree of life" is correct? Before Carl Woese, all cellular life forms were classified into five kingdoms: Monera, Fungi, Plants, Animals, and Protists. Using rRNA genes for phylogenetic reconstruction, Carl Woese uncovered a previously unrecognized group that was thought to be bacteria. Afterward, all cellular life forms were classified into three domains: Archaea, Bacteria, and Eucarya. It is found that the relationship among Archaea, Bacteria, and Eucarya changes, depending on which gene was used for phylogenetic reconstruction. All of the abovearrow_forwardSee the screenshot uploaded. Answer in a step-by-step format, add diagrams, and detailed side notes for a better understanding. For a more clear response please answer on paper Thank you!arrow_forward
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