Loose Leaf For Explorations: Introduction To Astronomy
9th Edition
ISBN: 9781260432145
Author: Thomas T Arny, Stephen E Schneider Professor
Publisher: McGraw-Hill Education
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Chapter 9, Problem 3TQ
To determine
The difference of life on earth and mars.
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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?
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…
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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Chapter 9 Solutions
Loose Leaf For Explorations: Introduction To Astronomy
Ch. 9 - How do Mercury, Venus, and Mars each compare with...Ch. 9 - How do the interior structures of Mercury, Venus,...Ch. 9 - What is the surface of Mercury like?Ch. 9 - Does Mercury have an atmosphere? Why or why not?Ch. 9 - Prob. 5QFRCh. 9 - What is the dominant gas in Venuss atmosphere? How...Ch. 9 - What are the clouds of Venus made of?Ch. 9 - Why is Venus so hot?Ch. 9 - Can we see the surface of Venus? Why or why not?...Ch. 9 - Prob. 10QFR
Ch. 9 - Prob. 11QFRCh. 9 - What are the Martian polar caps composed of?Ch. 9 - (9.3) What is the Martian atmosphere like?Ch. 9 - What is the evidence that Mars once had running...Ch. 9 - Prob. 15QFRCh. 9 - Prob. 16QFRCh. 9 - Prob. 17QFRCh. 9 - Prob. 18QFRCh. 9 - Prob. 1TQCh. 9 - Prob. 2TQCh. 9 - Prob. 3TQCh. 9 - Prob. 4TQCh. 9 - Prob. 5TQCh. 9 - Prob. 6TQCh. 9 - Prob. 7TQCh. 9 - Prob. 8TQCh. 9 - What role might planetesimal impacts have played...Ch. 9 - Prob. 1PCh. 9 - Prob. 2PCh. 9 - Prob. 3PCh. 9 - Prob. 4PCh. 9 - Olympus Mons is 26 kilometers above the...Ch. 9 - Prob. 6PCh. 9 - Prob. 1TYCh. 9 - Prob. 2TYCh. 9 - Prob. 3TYCh. 9 - Prob. 4TYCh. 9 - Prob. 5TYCh. 9 - Prob. 6TYCh. 9 - Prob. 7TYCh. 9 - Prob. 8TY
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- What are the three requirements that scientists believe an environment needs to supply life with in order to be considered habitable?arrow_forwardWhich of the following seems least reasonable regarding life on Earth? Group of answer choices There is much scientific evidence suggesting that all creatures living on Earth today appear to have evolved from a common ancestor. Louis Pasteur discredited the concept of spontaneous generation by demonstrating that even bacteria and other microorganisms arise from parents resembling themselves. There is ample physical evidence that the earliest life forms on Earth were multicellular creatures, perhaps resembling some of our primitive fish. When the earth formed some 4.6 billion years ago, it was a lifeless, inhospitable place. Before the mid-17th century, most people believed that God had created humankind and other higher organisms and that insects, frogs, and other small creatures could arise spontaneously in mud or decaying matter About billion years into its development, the Earth it was teeming with organisms resembling blue-green algae.arrow_forwardWhat are the advantages to using radio waves for communication between civilizations that live around different stars? List as many as you can.arrow_forward
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