Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Textbook Question
Chapter 13, Problem 15E
Give at least two reasons today’s astronomers are so interested in the discovery of additional Earthapproaching asteroids.
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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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- What evidence indicates that some asteroids once had geologically active surfaces?arrow_forwardHow would studying the chemical composition of only the largest, brightest, and most easily observed asteroids yield potentially misleading information about asteroids in general? Why is this called a selection effect?arrow_forwardIn addition to the ones mentioned in Exercise 13.3, what is the third, rarer class of asteroids?arrow_forward
- We believe that chains of comet fragments like Comet Shoemaker-Levy 9’s have collided not only with the jovian planets, but occasionally with their moons. What sort of features would you look for on the outer planet moons to find evidence of such collisions? (As an extra bonus, can you find any images of such features on a moon like Callisto? You can use an online site of planetary images, such as the Planetary Photojournal, at photojournal.jpl.nasa.gov.)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_forwardConsider an asteroid that orbits in a relatively circular orbit with a semimajor axis a = 2 au from the Sun. A typical asteroid has an albedo, or reflectivity, A ~ 0.3. At our closest approach to the asteroid, we make a measurement of the flux coming from the asteroid to be F = 3 × 10-15 w m-2. What is the radius of the asteroid in km? Include a labelled diagram along with your calculations.arrow_forward
- Approximately how many asteroids that are 0.89 km in radius would it take to make a planet which has a radius of 6590.0 km?arrow_forwardCalculate the orbital period of a comet nucleus in the Oort cloud.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_forward
- Which of the following statements about comets and asteroids is TRUE? Only asteroids collide with Earth All asteroids lie in a belt between Jupiter and Mars Comets are balls of ice and dust O Most of the trillions of comets in our Solar System have tailsarrow_forwardThe asteroid Pallas has a mass of 2.11 x 10^20 kg and an average radius of about 2.6 km (2.56 x 10^2 km) What is the escape velocity in (m/s). (Hint: use the formula for escape velocity; remember to concert units to m, kg, & s). ________ m/s could you jump off the asteroid? -yes -noarrow_forwardWhy are there no chondrules in achondritic meteorites?arrow_forward
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