Loose Leaf For Explorations: Introduction To Astronomy
9th Edition
ISBN: 9781260432145
Author: Thomas T Arny, Stephen E Schneider Professor
Publisher: McGraw-Hill Education
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Chapter 11, Problem 16QFR
To determine
To explain the life history of a comet from the Oort cloud that becomes a visible object to see.
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The European Space Agency’s (ESA) Rosetta mission reached Comet 67P at the time when the comet approached perihelion.
Figure 20 shows jets emerging from the comet.
Do these images confirm that comets are ‘dirty snowballs’? Why, or why not?
The mass of an average comet's nucleus is about 1.0 x 1014
kg. If the Oort cloud contains 2.0 x 101 comet nuclei, what is the mass of the cloud in
units of Earth masses? (Note: Earth's mass is 5.97 x 1024 kg.)
M.
Compare that with Saturn's mass. (Note: Saturn's mass in units of Earth's mass is 95.2 M.)
mass of the Oort cloud
mass of Saturn
The mass of an average comet's nucleus is about 1.0 x 1014 kg. If the Oort cloud contains 2.0 x 1011 comet nuclei, what is the mass of the cloud in units of Earth masses? (Note: Earth's mass is
5.97 x 1024 kg.)
M.
Compare that with Saturn's mass. (Note: Saturn's mass in units of Earth's mass is 95.2 Ma)
mass of the Oort cloud
mass of Saturn
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Chapter 11 Solutions
Loose Leaf For Explorations: Introduction To Astronomy
Ch. 11 - Prob. 1QFRCh. 11 - Prob. 2QFRCh. 11 - How is a meteor heated?Ch. 11 - Prob. 4QFRCh. 11 - Where are most asteroids found?Ch. 11 - Prob. 6QFRCh. 11 - (11.2) How do we know that asteroids have a...Ch. 11 - Prob. 8QFRCh. 11 - Prob. 9QFRCh. 11 - Prob. 10QFR
Ch. 11 - Prob. 11QFRCh. 11 - Prob. 12QFRCh. 11 - Prob. 13QFRCh. 11 - Prob. 14QFRCh. 11 - Prob. 15QFRCh. 11 - Prob. 16QFRCh. 11 - What creates meteor showers? When do some occur?Ch. 11 - Prob. 18QFRCh. 11 - Prob. 19QFRCh. 11 - Prob. 20QFRCh. 11 - Prob. 1TQCh. 11 - Prob. 2TQCh. 11 - Prob. 3TQCh. 11 - Prob. 4TQCh. 11 - Prob. 5TQCh. 11 - Prob. 6TQCh. 11 - Prob. 7TQCh. 11 - Prob. 8TQCh. 11 - Prob. 1PCh. 11 - Prob. 2PCh. 11 - Prob. 3PCh. 11 - Prob. 4PCh. 11 - Prob. 5PCh. 11 - Prob. 6PCh. 11 - Prob. 7PCh. 11 - Prob. 8PCh. 11 - Prob. 9PCh. 11 - Prob. 10PCh. 11 - Prob. 11PCh. 11 - Prob. 1TYCh. 11 - Prob. 2TYCh. 11 - Prob. 3TYCh. 11 - Prob. 4TYCh. 11 - Prob. 5TYCh. 11 - Prob. 6TYCh. 11 - Prob. 7TYCh. 11 - Prob. 8TYCh. 11 - Prob. 9TYCh. 11 - Prob. 10TYCh. 11 - Prob. 11TY
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- What does the cosmic ray exposure age tell us about the history of a meteorite?arrow_forwardThe Solar Nebula model introduces the concept of ‘frost line’. Where are asteroids and comets found with respect to this frost line? How is their location connected to their composition?arrow_forwardThe calculation in Example 13.1 refers to the known Oort cloud, the source for most of the comets we see. If, as some astronomers suspect, there are 10 times this many cometary objects in the solar system, how does the total mass of cometary matter compare with the mass of Jupiter?arrow_forward
- Meteorites were once part of which type of celestial object?arrow_forwardConsider the differentiated meteorites. We think the irons are from the cores, the stony-irons are from the interfaces between mantles and cores, and the stones are from the mantles of their differentiated parent bodies. If these parent bodies were like Earth, what fraction of the meteorites would you expect to consist of irons, stony-irons, and stones? Is this consistent with the observed numbers of each? (Hint: You will need to look up what percent of the volume of Earth is taken up by its core, mantle, and crust.)arrow_forwardGive brief descriptions of both the Kuiper belt and the Oort cloud.arrow_forward
- The mass of an average comets nucleus is about 1.0 1014 kg. If the Oort Cloud contains 2.0 1011 comet nuclei, what is the mass of the cloud in units of Earth masses? In units of Jupiters mass? (Notes: Earths mass in kg can be found in its Celestial Profile. Jupiters mass in kg can be found in its Celestial Profile.)arrow_forwardWhat evidence can you give that the Solar System formed about 4.6 billion years ago?arrow_forwardWhat evidence indicates that a comets nucleus is rich in ices?arrow_forward
- If the velocity of the solar wind is about 4.0 102 km/s and the visible tail of a comet is 1.0 108 km long, how many days does an atom in the solar wind take to travel from the nucleus to the end of the visible tail? (Nate: 1 day = 86,400 seconds.)arrow_forwardRefer to Example 13.1. How would the calculation change if a typical comet in the Oort cloud is larger-say, 50 km in diameter?arrow_forwardRefer to Example 13.1. How would the calculation change if a typical comet in the Oort cloud is only 1 km in diameter?arrow_forward
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