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Author Question: Suppose our Sun were suddenly replaced by a supergiant star. Which of the following would be true? ... (Read 87 times)

formula1

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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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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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Both answers were spot on, thank you once again




 

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