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Author Question: Cepheid variable stars stop pulsating when: A) they evolve out of the instability strip of the ... (Read 73 times)

NguyenJ

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on: Jul 27, 2018
Cepheid variable stars stop pulsating when:
 
  A) they evolve out of the instability strip of the H-R diagram.
  B) they enter the zero-age main sequence.
  C) they begin their stable lives fusing hydrogen.
  D) they reach the lower edge of the main sequence of the H-R diagram.

Question 2

__________are objects used to map spiral arms.
 
  A) Spiral locators
  B) Spiral tracers
  C) Arm finders
  D) Spiral waves


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Toya9913

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

A

Answer to Question 2

B


NguyenJ

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Reply 2 on: Jul 27, 2018
:D TYSM

peter

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Reply 3 on: Yesterday
Excellent

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