Mindtap Astronomy, 1 Term (6 Months) Printed Access Card For Seeds/backman's Foundations Of Astronomy, 14th
Mindtap Astronomy, 1 Term (6 Months) Printed Access Card For Seeds/backman's Foundations Of Astronomy, 14th
14th Edition
ISBN: 9781337399975
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 16, Problem 1SOP

Arrange the following in order of increasing size: our Milky Way Galaxy; a globular star cluster; a pair of radio lobes around an active galaxy; a giant elliptical galaxy; the Solar System; the Local Group galaxy cluster

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A given star orbits the center of its galaxy at an average speed of v_star, at a distance of r_star​ from the center.  The galaxy has 2 spiral arms, and the arms themselves orbit slower than the star -- at the same radius, they orbit at a speed of v_arm (in the same direction as the star).  The galaxy's age is t_gal. In the history of this galaxy, how many times did this star cross through a spiral arm? Values: v_star​ = 200 km/s, r_star​ = 9 kpc, v_arms​ = 46 km/s, t_gal​ = 4 Gyr
The Sun is located in   a. the center of the Milky Way Galaxy   b. the bulge of the Milky Way Galaxy   c. the halo of the Milky Way Galaxy   d. the disk of the Milky Way Galaxy
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