21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Concept explainers

Question
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Chapter 19, Problem 1QP
To determine

Among the following which one contributes largest percentage to the total mass of a spiral galaxy.

Expert Solution & Answer
Check Mark

Answer to Problem 1QP

Option (a).

Explanation of Solution

Spiral galaxy is a type of galaxy that is characterized by spiral arms, and these spiral arms lie in flattened and rotating disk. The stars in flat disk orbit the centre of the galaxy in the same direction.

Dark matter contributes largest percentage to the total mass of a spiral galaxy. It contributes upto 90% of galaxy’s mass.

The dark matter interacts with the light very weakly, and the nature of the dark matter is yet to be known.

Conclusion:

Since dark matter contributes 90% of galaxy’s mass, option (a) is correct.

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