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Author Question: Stellar spectra tell us that ________ is the second most abundant element in the Sun. A) carbon ... (Read 48 times)

xclash

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on: Jul 27, 2018
Stellar spectra tell us that ________ is the second most abundant element in the Sun.
 
  A) carbon B) helium C) iron D) hydrogen E) oxygen

Question 2

On what basis are we sure that no quasar is lurking among the thousands of member galaxies in the Virgo Cluster, 18 Mpc distant?
 
  What will be an ideal response?


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britb2u

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

B

Answer to Question 2

Quasars are far more luminous visually than normal galaxies, so at that distance, a quasar would be bright enough to see with the naked eye The distance to the closest quasar is still more than a 100 Mpc.


xclash

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Reply 2 on: Jul 27, 2018
Thanks for the timely response, appreciate it

nguyenhoanhat

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Reply 3 on: Yesterday
Wow, this really help

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