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# Choose the best answer to each of the | Ch 11 - 2QQ

ISBN: 9780133889567 46

## Solution for problem 2QQ Chapter 11

The Cosmic Perspective Fundamentals | 2nd Edition

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The Cosmic Perspective Fundamentals | 2nd Edition

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Problem 2QQ

Choose the best answer to each of the following. Explain your reasoning with one or more complete sentence.

Why do disk stars bob up and down as they orbit the galaxy? (a) because the gravitational pull of other disk stars pulls them toward the disk (b) because of friction with the interstellar medium (c) because the halo stars keep knocking them back into the disk

Step-by-Step Solution:
Step 1 of 3

Spectral Classes  O’s and B’s o High masses > 6 M sun o High temperatures > 12,000K o High luminosity > 1,000 L sun o Short lives < 1 billion years o Burn Hydrogen, Helium, Oxygen, Carbon… up to Iron  A’s, F’s, G’s o Moderate stars o Generally long lived  Up to 20 billion years  K’s & M’s o Low mass, temperature, and luminosity o Longest lives  Up to 50 trillion year  400 times the age of the universe The Seven Stars  Each star is representative of a spectral class o Subclasses run from 0 and 9 o Ex. B3 is hotter than B4 but cooler than B2 o K9 is the coolest K-class but just hotter than M0

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##### ISBN: 9780133889567

The Cosmic Perspective Fundamentals was written by and is associated to the ISBN: 9780133889567. The full step-by-step solution to problem: 2QQ from chapter: 11 was answered by , our top Physics solution expert on 07/18/17, 06:37AM. This textbook survival guide was created for the textbook: The Cosmic Perspective Fundamentals, edition: 2. This full solution covers the following key subjects: disk, stars, halo, Bob, choose. This expansive textbook survival guide covers 15 chapters, and 313 solutions. Since the solution to 2QQ from 11 chapter was answered, more than 293 students have viewed the full step-by-step answer. The answer to “Choose the best answer to each of the following. Explain your reasoning with one or more complete sentence.Why do disk stars bob up and down as they orbit the galaxy? (a) because the gravitational pull of other disk stars pulls them toward the disk (b) because of friction with the interstellar medium (c) because the halo stars keep knocking them back into the disk” is broken down into a number of easy to follow steps, and 64 words.

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Choose the best answer to each of the | Ch 11 - 2QQ