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Author Question: Why is hydrogen less obvious in B stars than in A class? What will be an ideal ... (Read 68 times)

vinney12

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on: Jul 27, 2018
Why is hydrogen less obvious in B stars than in A class?
 
  What will be an ideal response?

Question 2

If the density of the universe is greater than critical, then
 
  A) the universe will end up as nothing but black holes.
  B) the universe will continue expanding forever.
  C) there is more matter than energy.
  D) the universe is closed, gravity wins, and will shrink to the Big Crunch.
  E) the universe is flat, and Euclid is right.


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coreycathey

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

Above 10,000K, the hydrogen atoms are mostly ionized, and not able to absorb photons any more.

Answer to Question 2

D


vinney12

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Reply 2 on: Jul 27, 2018
Gracias!

sultansheikh

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Reply 3 on: Yesterday
Excellent

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