Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 8, Problem 17Q
To determine
The meaning of protoplanetary disks.
The plausibility of model of solar system’s origin as explained by protoplanetary disks.
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Chapter 8 Solutions
Universe: Stars And Galaxies
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- Describe the solar nebula, and outline the sequence of events within the nebula that gave rise to the planetesimals.arrow_forwardHow do we know when the solar system formed? Usually we say that the solar system is 4.5 billion years old. To what does this age correspond?arrow_forwardHow does the solar nebula theory explain the orbits of the major planets? Dwarf planets? Does it explain the rotations of the planets? Why or why not?arrow_forward
- What can we learn about the formation of our solar system by studying other stars? Explain.arrow_forwardWhere would you look for some “original” planetesimals left over from the formation of our solar system?arrow_forwardHow do the planets discovered so far around other stars differ from those in our own solar system? List at least two ways.arrow_forward
- If you could visit another planetary system while the planets are forming, would you expect to see the condensation sequence at work, or do you think that process was most likely unique to our Solar System? How do the properties of the extrasolar planets discovered so far affect your answer? Do you expect the most planetary system in the Universe have analogs to our Solar System’s asteroid belt and Kuiper Belt? Would all planetary systems show signs of an age of heavy bombardment? If the solar nebula hypothesis is correct, do you think there are more planets in the Universe than stars? Why or why not?arrow_forwardNearly all planets that astronomers have found orbiting other stars have been giant planets with masses more like Jupiter than Earth, and with orbits located very close to their parent stars. Does this prove that our Solar System is unique? Explain your answer.arrow_forwardKepler-444 is one of many stars with terrestrial planets that is over 10 billion a) What do you think the spectral type of Kepler-444 might be? b) How do stars of this spectral type end their lives? c) If evolution followed a similar course on a habitable pranet around a star similar to Kepler-444, it would be 5 billion years more advanced than we are. Let’s try to project our future and see what happens. In particular, suppose our civilization gets motivated enough to colonize another planet. Kepler indicates that most stars have potentially habitable (and colonizable) planets, so roughly how far away is the typical “nearest" planet? d) The New Horizons probe on its way to Pluto took 9 years to travel 30 AU. If we could send colony ships with the same average speed, roughly how long would it take to reach the typical nearest planet? уears old.arrow_forward
- How do the planets in our solar system, for example Jupiter, affect the orbits of the other planets? How relatively stable are the orbits of the planets in the solar system?arrow_forwardHow probable is it that other solar systems will have habitable planets, given what you know about the solar nebula theory? Take a look at NASA's Kepler mission and write a half-page summary of it.arrow_forwardWhy do we say the Neptune was the first planet to be discovered through the use of mathmatics?arrow_forward
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