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Author Question: The most prominent theory about spiral arms is called the _____. A) spiral quantum fluctuations ... (Read 139 times)

Metfan725

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on: Jul 27, 2018
The most prominent theory about spiral arms is called the _____.
 
  A) spiral quantum fluctuations
  B) spiral gravitational collapse
  C) spiral density wave theory
  D) spiral radiation theory

Question 2

To find the age of a cluster, astronomers must know:
 
  A) the distance to the cluster.
  B) the number of stars in the cluster.
  C) the iron content of all the stars in the cluster.
  D) the orbital motion of all the stars in the cluster.


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Jayson

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Reply #1 on: Jul 27, 2018
Answer to Question 1

C

Answer to Question 2

A


Metfan725

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Reply 2 on: Jul 27, 2018
Excellent

xiaomengxian

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Reply 3 on: Yesterday
Gracias!

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