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Author Question: Our galaxy is suspected to be surrounded by a galactic halo or corona because the disk of the galaxy ... (Read 227 times)

mckennatimberlake

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on: Jul 27, 2018
Our galaxy is suspected to be surrounded by a galactic halo or corona because the disk of the galaxy
 
  a. rotates faster than expected in its outer region.
  b. rotates more slowly than expected in its outer region.
  c. is only visible during a total eclipse of our Sun.
  d. is surrounded above, below, and well beyond by the brightly glowing corona.

Question 2

How do the spectra of giants, supergiants, and main-sequence stars differ?
 
  What will be an ideal response?


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diana chang

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

a

Answer to Question 2

Supergiants have very narrow spectral lines, and main-sequence stars have broad lines. Giant stars have spectral lines in between these two.


mckennatimberlake

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Reply #2 on: Jul 27, 2018
TY


diana chang

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Reply #3 on: Jul 27, 2018
You're welcome


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