21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 7.2, Problem 7.2CYU
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Which of the following statements is correct?
a. The formation of planets stopped because the solar nebula got cooler
c. The formation of planets stopped because the solar nebula ran out of planetesimals
d. The formation of planets stopped because the solar nebula spinning was slowing down
e. The formation of planets stopped because the young Sun's strong solar wind swept away material not yet accreted onto the planets
Which of the following observations would support the solar nebula theory over the passing star hypothesis?
a.
Proving that most of the sun-like stars near the sun also have planets orbiting them.
b.
Proving that none of the stars near the sun has planets orbiting them.
c.
Finding a planet located beyond the orbit of Pluto.
d.
Finding a meteorite whose age proved to be greater than 4.6 billion years.
e.
Proving that Mercury has the same uncompressed density as Earth.
12. Why is Jupiter so much riches in hydrogen and hellum than Earth?
Chapter 7 Solutions
21st Century Astronomy
Ch. 7.1 - Prob. 7.1CYUCh. 7.2 - Prob. 7.2CYUCh. 7.3 - Prob. 7.3CYUCh. 7.4 - Prob. 7.4CYUCh. 7.5 - Prob. 7.5CYUCh. 7 - Prob. 1QPCh. 7 - Prob. 2QPCh. 7 - Prob. 3QPCh. 7 - Prob. 4QPCh. 7 - Prob. 5QP
Ch. 7 - Prob. 6QPCh. 7 - Prob. 7QPCh. 7 - Prob. 8QPCh. 7 - Prob. 9QPCh. 7 - Prob. 10QPCh. 7 - Prob. 11QPCh. 7 - Prob. 12QPCh. 7 - Prob. 13QPCh. 7 - Prob. 14QPCh. 7 - Prob. 15QPCh. 7 - Prob. 16QPCh. 7 - Prob. 17QPCh. 7 - Prob. 18QPCh. 7 - Prob. 19QPCh. 7 - Prob. 20QPCh. 7 - Prob. 21QPCh. 7 - Prob. 22QPCh. 7 - Prob. 23QPCh. 7 - Prob. 24QPCh. 7 - Prob. 25QPCh. 7 - Prob. 26QPCh. 7 - Prob. 27QPCh. 7 - Prob. 28QPCh. 7 - Prob. 29QPCh. 7 - Prob. 30QPCh. 7 - Prob. 31QPCh. 7 - Prob. 32QPCh. 7 - Prob. 33QPCh. 7 - Prob. 34QPCh. 7 - Prob. 35QPCh. 7 - Prob. 36QPCh. 7 - Prob. 37QPCh. 7 - Prob. 38QPCh. 7 - Prob. 39QPCh. 7 - Prob. 40QPCh. 7 - Prob. 41QPCh. 7 - Prob. 42QPCh. 7 - Prob. 43QPCh. 7 - Prob. 44QPCh. 7 - Prob. 45QP
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- How do astronomers account for the origin of Pluto?arrow_forwardWhy would astronomically short lifetime of gas and dust disks around protostars pose a problem in understanding how the Jovian planets formed? What modification of the solar nebula theory might solve this problem?arrow_forwardHow does the solar nebula theory explain the dramatic density difference between the Terrestrial and Jovian planets?arrow_forward
- What does the term differentiated mean when applied to a planet? Would you expect to find that planets are usually differentiated? Why?arrow_forwardWhat can we learn about the formation of our solar system by studying other stars? Explain.arrow_forwardImagine that you visit a planet orbiting another star and discover that it is heavily cratered, but its small moon is nearly crater free. Why would that be a surprise? Speculate about what might have happened to those objects.arrow_forward
- Problem 5. Physical Features of the Giant Planets: Appearance of the Atmosphere of Neptune. Explain why the atmosphere of Neptune appears the way it does.arrow_forwardThe dust in the dust clouds in intersteller space consists of? a. atomic gas b. molecular gas c. tiny solid grains d. pieces of ice ranging from several meters to a kilometer in diameterarrow_forward5 Given that molecular clouds have temperatures of ~10K and a typical number density of H atoms of ~104 cm-3, determine whether it is possible to form Jupiter-mass planets from direct gravitational collapse. Assume that the cloud is composed entirely of Hydrogen atomsarrow_forward
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