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Author Question: Suppose our Sun were suddenly replaced by a supergiant star. Which of the following would be true? ... (Read 27 times)

formula1

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on: Jul 27, 2018
Suppose our Sun were suddenly replaced by a supergiant star. Which of the following would be true?
 
  A) The supergiant would appear as large as the full Moon in our sky.
  B) Earth would fly off into interstellar space.
  C) The supergiant's surface temperature would be much hotter than the surface temperature of our Sun.
  D) Earth would be inside the supergiant.

Question 2

Why can the Tully-Fisher relation be used at greater distances than Cepheids?
 
  What will be an ideal response?


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kbennett34

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

D

Answer to Question 2

We must image the individual star and follow its light curve for the period-luminosity relation of Cepheids, but the Tully-Fisher relation depends on the light of the galaxy having its spectral lines broadened by the galaxy's spin; this can be detected from far larger distances than single star images can.


formula1

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Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


kbennett34

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Reply #3 on: Jul 27, 2018
Great! Please up vote :D


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