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Author Question: If gravity alone acts to retard the expansion and nothing acts to accelerate it, the Universe is ... (Read 107 times)

KWilfred

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on: Jul 27, 2018
If gravity alone acts to retard the expansion and nothing acts to accelerate it, the Universe is said to be closed if I. gravity is strong enough to stop the expansion in a finite time. II. the density of the Universe is less than the critical density. III. the Universe is finite.
 
  a. I & II
  b. I & III
  c. II & III
  d. I, I, & III
  e. None of the other choices are correct.

Question 2

The spectra of Type II supernova contain no hydrogen lines.
 
  a. True
  b. False
  Indicate whether the statement is true or false


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paavo

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

b

Answer to Question 2

False


KWilfred

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Reply #2 on: Jul 27, 2018
Thank you!


paavo

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Reply #3 on: Jul 27, 2018
Always glad to help...


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