Foundations of Astronomy (MindTap ...

14th Edition
Michael A. Seeds + 1 other
Publisher: Cengage Learning
ISBN: 9781337399920



Foundations of Astronomy (MindTap ...

14th Edition
Michael A. Seeds + 1 other
Publisher: Cengage Learning
ISBN: 9781337399920
Chapter 15, Problem 9P
Textbook Problem

If the Sun is 4.6 billion years old, how many times has it orbited the Milky Way Galaxy?

To determine

The number of time sun has orbited the Milky Way Galaxy.

Explanation of Solution

The expression for number of times the sun has orbited the Galaxy is,

    N=tT        (I)

Here, T is the time taken, N is the number of times and t is the orbital period of the Sun around the galactic center.


Substitute 4.6billionyears for t and 210billionyears for T  in equation (I) to find N .


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Chapter 15 Solutions

Foundations of Astronomy (MindTap Course List)
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Ch. 15 - List three different spiral tracers. Why is each...Ch. 15 - Why do all spiral tracers seem to be young?Ch. 15 - Do the stars within the spiral arms, and the...Ch. 15 - Are spiral arms the same as density waves? Why or...Ch. 15 - What color is the central bulge? The spiral arms?...Ch. 15 - If a galaxys only process producing spiral...Ch. 15 - Is the Milky Way Galaxy a grand-design spiral, a...Ch. 15 - How does self-sustaining star formation produce...Ch. 15 - Why must astronomers use infrared and radio...Ch. 15 - What evidence can you give that the nucleus of our...Ch. 15 - Could the black hole in the nucleus of the Milky...Ch. 15 - Which formed last: the visible halo, the galactic...Ch. 15 - Why are metals less abundant in older stars than...Ch. 15 - Where are the stars with the most abundant metals...Ch. 15 - Why do metal-poor stars have a wider range of...Ch. 15 - How does a galactic fountain spread metals through...Ch. 15 - Rank these objects from oldest to youngest the...Ch. 15 - What evidence contradicts the top-down hypothesis...Ch. 15 - Calibration simplifies complex measurements. How...Ch. 15 - The story of a process makes the facts easier to...Ch. 15 - Make a scale sketch of the Milky Way Galaxy in...Ch. 15 - Because of interstellar dust, astronomers can see...Ch. 15 - If a standard passenger aircraft can fly at 0.25...Ch. 15 - If a typical halo star has an orbital velocity of...Ch. 15 - Find the distance to Polaris, a type I (classical)...Ch. 15 - If the RR Lyrae stars in a globular cluster have...Ch. 15 - If interstellar dust makes an RR Lyrae variable...Ch. 15 - If you assume that a globular cluster 4.0 arc...Ch. 15 - If the Sun is 4.6 billion years old, how many...Ch. 15 - If astronomers find they have made a mistake and...Ch. 15 - What temperature would a cloud of interstellar...Ch. 15 - Infrared radiation from the center of our Galaxy...Ch. 15 - If an object at the center of the Milky Way Galaxy...Ch. 15 - The Suns absolute magnitude is +4.8. Using the...Ch. 15 - What is the ratio of metals in Population I stars...Ch. 15 - The Milky Way Galaxy is about 100 million times...Ch. 15 - If you represent the age of the Universe, 13.8...Ch. 15 - Look at Figure 15-3. Why is the center of the...Ch. 15 - Look at Figure 15-6. Compare and contrast the two...Ch. 15 - Why does the galaxy shown here have so much dust...Ch. 15 - Why are the spiral arms in the galaxy in this...

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