Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Textbook Question
Chapter 13, Problem 4E
In addition to the ones mentioned in Exercise 13.3, what is the third, rarer class of asteroids?
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As of 2012, how many near-Earth asteroids, with sizes over 1km, had been discovered by the Spaceguard survey?
a Only a few dozen
b Nearly 1000
c Nearly 50,000
d About 500
The diameter of an asteroid is 954 km and its mass is 9.4 x 1020 kg. What is the density in g/cm3?
g/cm3
Is the asteroid made of water, rock, or a mix?
O water (1 g/cm³)
O rock (2.5-5 g/cm3)
O mix (between 1-2.4 g/cm3)
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Approximately how many asteroids that are 0.99 km in radius would it take to make a planet which has a radius of 6460.0 km?
Chapter 13 Solutions
Astronomy
Ch. 13 - Why are asteroids and comets important to our...Ch. 13 - Give a brief description of the asteroid belt.Ch. 13 - Describe the main differences between C-type and...Ch. 13 - In addition to the ones mentioned in Exercise...Ch. 13 - Vesta is unusual as it contains what mineral on...Ch. 13 - Compare asteroids of the asteroid belt with...Ch. 13 - Briefly describe NASA’s Spaceguard Survey. How...Ch. 13 - Who first calculated the orbits of comets based on...Ch. 13 - Describe the nucleus of a typical comet and...Ch. 13 - Describe the two types of comet tails and how each...
Ch. 13 - What classification is given to objects such as...Ch. 13 - Describe the origin and eventual fate of the...Ch. 13 - What evidence do we have for the existence of the...Ch. 13 - Give brief descriptions of both the Kuiper belt...Ch. 13 - Give at least two reasons today’s astronomers are...Ch. 13 - Suppose you were designing a spacecraft that would...Ch. 13 - Suppose you were designing a spacecraft that would...Ch. 13 - Suppose a comet were discovered approaching the...Ch. 13 - We believe that chains of comet fragments like...Ch. 13 - Why have we found so many objects in the Kuiper...Ch. 13 - Why is it hard to give exact diameters for even...Ch. 13 - Refer to Example 13.1. How would the calculation...Ch. 13 - Refer to Example 13.1. How would the calculation...Ch. 13 - The calculation in Example 13.1 refers to the...Ch. 13 - If the Oort cloud contains 1012 comets, and ten...Ch. 13 - The mass of the asteroids is found mostly in the...Ch. 13 - Make a similar estimate for the mass of the Kuiper...Ch. 13 - What is the period of revolution about the Sun for...Ch. 13 - What is the period of revolution for a comet with...
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- Why do astronomers conclude that asteroids were never part of a full-sized planet?arrow_forwardSuppose there are 106 (1 million) asteroids that are 1.03 km in radius. If they were all combined into single sphere, calculate the radius of this sphere in km.arrow_forwardAt what average distances (in AU) from the Sun would you expect to find Kirkwood gaps where the orbital period of asteroids are respectively four-ninths, and three-sevenths, of the orbital period of Jupiter? (Hint: use Kepler's third law.) Compare your results with the figure.arrow_forward
- Give at least two reasons today’s astronomers are so interested in the discovery of additional Earthapproaching asteroids.arrow_forwardAt what average distances (in AU) from the Sun would you expect to find Kirkwood gaps where the orbital period of asteroids are respectively four-ninths, and three-sevenths, of the orbital period of Jupiter? (Hint: use Kepler's third law.) inner gap at_______ AU outer gap at_______ AUarrow_forwardRe-order the numbers so the events occur in the correct order, with the oldest event as number 2, and the youngest event as number 13. 2. Now at roughly 100% of present-day mass and the asteroid bombardment over, Earth begins cooling and differentiating. As the outer layer of the Earth cools and solidifies, lighter elements and compounds rise to the surface while the denser ones sink to the core 3. The now differentiated ice, gas, and dust of the solar accretion disc conglomerates together into asteroids from gravity 4. "The Big Whack" A Mars-sized protoplanet we call Theia collides with primitive Earth, adding even more energy and mass 5. The Big Bang 6. As the early atmosphere cools, water vapor is eventually cool enough to condense into liquid water, eventually covering the planet in an ocean 7. The debris from the collision of Earth and Theia produce a ring in orbit. This ring eventually coalesces into the Moon, just as Earth coalesced from the solar accretion disc 8. A nebula…arrow_forward
- At what average distances (in AU) from the Sun would you expect to find Kirkwood gaps where the orbital period of asteroids are respectively four-ninths, and two-fifths, of the orbital period of Jupiter? (Hint: use Kepler's third law.) inner gap at AU outer gap at AU Compare your results with the figure. 7:2 3:1 8,3 5;2 7:3 9:4 2;1 9:5 7:4 53 8:5 3:2 Resonances Gap Gap Gap Gap GapGap Gap Distance from sun (AU) O The results agree with the figure. O The results do not agree with the figure.arrow_forwardThe asteroid Vesta has a mass of 2.59 x 1020 kg and an average radius of about 263 km (2.63 x 102 km). What is its escape velocity (in m/s)? (Hints: Use the formula for escape velocity, V. = 2GM -; remember to convert units to m, kg, and s.) m/s Could you jump off the asteroid? O Yes O Noarrow_forwardIt is believed that there are a 1.2 × 1012 comets in the Oort Cloud, which has a radius of 74000.0 AU. What is the total volume of the Oort Cloud in cubic AU?arrow_forward
- Suppose an asteroid has a semimajor axis of 4 AU. How long does it take the asteroid to go around the Sun? (a) 2 years (b) 4 years (c) 6 years (d) 8 yearsarrow_forwardWhat is the evidence that suggests asteroids might have geologically active surfaces?arrow_forwardSuppose the average mass of each of 20,000 asteroids in the solar system is 1017 kg. Compare the total mass of these asteroids to the mass of Earth. Assuming a spherical shape and a density of 3000 kg/m3, estimate the diameter of an asteroid having this average mass.arrow_forward
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