Understanding Our Universe
Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 18, Problem 16QAP
To determine

The length of time an intelligent communicating civilization will last affects which variable in Drake equation.

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The Drake equation tells us that the number of technological civilizations in our Galaxy at this time is: Group of answer choices   About 100,000.   About 14 billion.   About 200 billion.   It cannot predict this number at this time.   About 6,000.   About 1 million.   Somewhere in the range 1-10.
Which of the following is not considered a likely solution to the question of why we are not currently aware of an extraterrestrial civilization? Group of answer choices   There is no civilization because civilizations are not common.   The civilization is probably undetectable to us because it makes use of technologies that do not obey the known laws of physics.   There is no galactic civilization because civilizations do not leave their home worlds.   There is no civilization because most civilizations destroy themselves before achieving interstellar travel.   The civilization is deliberately avoiding contact with us.
Which 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.
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