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Author Question: The key to finding quasars' distances was A) planetary nebula in M51. B) globular clusters in ... (Read 35 times)

sheilaspns

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on: Jul 27, 2018
The key to finding quasars' distances was
 
  A) planetary nebula in M51.
  B) globular clusters in the halo of M87 in Virgo.
  C) a Type I supernova in the spiral arm of 3C87.
  D) the luminosity of 3C52 from the Doppler shift and the Fisher-Tully relation.
  E) the huge redshifts of the hydrogen lines in 3C273.

Question 2

Define shepherd moons and give an example of them at work.
 
  What will be an ideal response?


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kaykay69

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

E

Answer to Question 2

The two small moons on each side of Saturn's F ring herd the particles into this narrow, twisted ring.


sheilaspns

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Reply 2 on: Jul 27, 2018
Excellent

nothere

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Reply 3 on: Yesterday
:D TYSM

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