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Author Question: The relation between the Doppler shift of galaxies and their distances is called A) the ... (Read 74 times)

crazycityslicker

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on: Jul 27, 2018
The relation between the Doppler shift of galaxies and their distances is called
 
  A) the cosmological principle.
  B) Hubble's law.
  C) special relativity.
  D) Olbers's paradox.
  E) general gelativity.

Question 2

What special type of information is yielded only by eclipsing binary stars?
 
  What will be an ideal response?


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catron30

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

B

Answer to Question 2

The analysis of the light curve of eclipsing binaries allows us to measure their sizes. As most are spectroscopic binaries as well, we can use their speeds and durations of various stages of the eclipse to directly measure their diameters. Basically, the longer the eclipse takes, the bigger the star is.


crazycityslicker

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Reply 2 on: Jul 27, 2018
Excellent

bdobbins

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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