Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 8, Problem 23Q
To determine
To explain: The meaning of planetesimals and the reason for the origin of terrestrial planets from them.
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Out of the inner planets in the solar system (Mercury, Venus and Mar) which do you think is the most likely to be colonized? Explain why?
What is the frost line in the solar nebula? Explain how temperature differences led to the formation of two distinct types of planets.
We think the terrestrial planets formed around solid “seeds” that later grew over time through the accretion of rocks and metals.
a) Suppose the Earth grew to its present size in 1 million years through the accretion of particles averaging 100 grams each. On average, how many particles did the Earth capture per second, given that the mass of the Earth is = 5.972 × 10 ^24 kg ?
b) If you stood on Earth during its formation and watched a region covering 100 m^2, how many impacts would you expect to see in one hour. Use the impact rate you calculated in part a. You’ll need the following as well: the radius of the Earth is = 6.371 × 10 ^6 m and the surface area of the Earth is 4??^2Earth
Chapter 8 Solutions
Universe
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Where would you look for some “original” planetesimals left over from the formation of our solar system?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_forwardDescribe the four stages of Terrestrial planet development.arrow_forward
- Describe the solar nebula, and outline the sequence of events within the nebula that gave rise to the planetesimals.arrow_forwardWhat happens if a planet has differentiated? Would you expect differentiation to be common among the planets? Why or why not?arrow_forwardOrder the following steps in the formation of a Terrestrial planet chronologically: gravitational collapse, accretion, out-gassing, condensation, and differentiation.arrow_forward
- What is the difference between a planetesimal and a protoplanet?arrow_forwardGiven what you've learned about the solar nebula idea, what do you believe the likelihood is of discovering livable planets in other solar systems? Learn more about this search by visiting NASA's Kepler mission and writing a half-page overview of the project.arrow_forwardQuestion #4: According to the nebular theory, which planet is most likely to be gaseous rather than rocky? A. Venus, because it is the warmest planet and so is more likely to be gaseous B. Mercury, because planets closer to the solar nebula are more likely to be made of gas, like the nebula C. Earth, because the atmosphere consists of nitrogen, oxygen, and other gases, so it is a gaseous planet D. Neptune, because as the planets get farther from the solar nebula, their composition is more icy and gaseous e Education TM Inc. RK12arrow_forward
- What are two differences between the terrestrial (rocky) planets and the Gas giants?arrow_forwardThe solar nebula idea suggests that other solar systems may include livable planets, but how likely is this? A half-page synopsis of NASA's Kepler project is due this week.arrow_forward7. Complete the table below for the habitability of several solar system planets. Temperature can be hot, moderate, or cold. Amount of atmosphere can be thin, thick, or moderate. Liquid wa- ter amount can be lots, little, or none. Planet Venus Temperature Liquid Water Atmosphere Earth Marsarrow_forward
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