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The Essential Cosmic Perspective Study Set 1

Physics & Astronomy

Quiz 19 :

Life in the Universe

Quiz 19 :

Life in the Universe

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Which of the following best describes what we mean by a habitable world?
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Multiple Choice
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Answer:

C

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Suppose it turns out that one in 1 million stars has a planet that at some point in its history is home to an advanced civilization. Then the total number of civilizations that have arisen in our galaxy would be closest to .
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Multiple Choice
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Answer:

C

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Where have scientists begun an active search for life beyond the Earth?
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Multiple Choice
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Answer:

C

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According to fossil evidence, how far back in time did life on Earth exist?
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Which of the following is considered by biologists to be a likely place where life might have first arisen on Earth?
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Which of the following was the most important for maintaining the Earth's stable climate over the time it took for large organisms to evolve?
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How did oxygen (O₂)get into Earth's atmosphere?
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What is the Fermi Paradox?
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What evidence suggests that life arises relatively easily?
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Which of the following best describes natural selection?
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Why is Europa considered a good candidate for the possible existence of life?
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At present, what is the primary way that the search for extraterrestrial intelligence (SETI)is carried out?
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Why are relatively few details known about the life that existed on Earth prior to a few hundred million years ago?
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Which of the following statements best reflects our current knowledge about the term flife in the equation Number of Civilizations = NHP × flife × fcivilization × fnow?
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Which of the following gases, which we can detect (if present)in infrared spectra, would be a strong indicator of life on another planet?
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What are scientists' best guess(es)for the requirement(s)of life?
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Why do some scientists say that the Moon may have been important for the evolution of life on the Earth?
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After Mars, the next most likely candidates for life in the solar system are
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The figure above shows the geological times scale. Life has existed for of the Earth's history.
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Which of the following best explains why an interstellar ramjet could, in theory, achieve continuous acceleration?
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