21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Question
Chapter 12, Problem 30QP
To determine
The contribution of the comets and asteroids to the origin of life on Earth.
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why do scientists generally think that liquid water is necessary for the origin of life?
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If there was a planet orbiting a first generation star, which planet in our solar system would it resemble most? Would it be likely for such a planet to have life?
Life on Earth is considered by many scientists to have evolved because of a string of very fortunate events. Which of the following is least likely to have been a contributing factor?
Group of answer choices
Dominant tidal effects by the Sun
Well-positioned Jupiter
Enough time for evolution
Moon stabilizes tilt
Safe radiation levels
Chapter 12 Solutions
21st Century Astronomy
Ch. 12.1 - Prob. 12.1CYUCh. 12.2 - Prob. 12.2CYUCh. 12.3 - Prob. 12.3ACYUCh. 12.3 - Prob. 12.3BCYUCh. 12.4 - Prob. 12.4CYUCh. 12.5 - Prob. 12.5CYUCh. 12 - Prob. 1QPCh. 12 - Prob. 2QPCh. 12 - Prob. 3QPCh. 12 - Prob. 4QP
Ch. 12 - Prob. 5QPCh. 12 - Prob. 6QPCh. 12 - Prob. 7QPCh. 12 - Prob. 8QPCh. 12 - Prob. 9QPCh. 12 - Prob. 10QPCh. 12 - Prob. 11QPCh. 12 - Prob. 12QPCh. 12 - Prob. 13QPCh. 12 - Prob. 14QPCh. 12 - Prob. 15QPCh. 12 - Prob. 16QPCh. 12 - Prob. 17QPCh. 12 - Prob. 18QPCh. 12 - Prob. 19QPCh. 12 - Prob. 20QPCh. 12 - Prob. 22QPCh. 12 - Prob. 23QPCh. 12 - Prob. 24QPCh. 12 - Prob. 25QPCh. 12 - Prob. 26QPCh. 12 - Prob. 27QPCh. 12 - Prob. 28QPCh. 12 - Prob. 29QPCh. 12 - Prob. 30QPCh. 12 - Prob. 31QPCh. 12 - Prob. 32QPCh. 12 - Prob. 33QPCh. 12 - Prob. 34QPCh. 12 - Prob. 35QPCh. 12 - Prob. 36QPCh. 12 - Prob. 37QPCh. 12 - Prob. 38QPCh. 12 - Prob. 39QPCh. 12 - Prob. 40QPCh. 12 - Prob. 41QPCh. 12 - Prob. 42QPCh. 12 - Prob. 43QPCh. 12 - Prob. 44QP
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- Why is liquid water generally considered necessary for the origin of life?arrow_forwardLife on Earth exists because of oxygen in Earths atmosphere. True false? Explain your answer.arrow_forwardIf we do find life on Mars, what might be some ways to check whether it formed separately from Earth life, or whether exchanges of material between the two planets meant that the two forms of life have a common origin?arrow_forward
- What kind of evidence do you think would convince astronomers that an extraterrestrial spacecraft has landed on Earth?arrow_forwardMolecules of which gas were needed in Earths atmosphere for life to evolve from living in the sea to living on the land? Why?arrow_forwardWhy is life unlikely to be found on the surface of Mars today?arrow_forward
- Is it likely that life ever existed on either Venus or Mars? Justify your answer in each case.arrow_forwardWhat are some reasons that more advanced civilizations might want to send out messages to other star systems?arrow_forwardConsider Figure 25-8. What is the ratio of the length of time since the origin of fish to the time since the origin of mammals? What does this value indicate?arrow_forward
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