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Author Question: Whether the Universe is open, closed or flat depends, on the ___________ of the Universe. a. ... (Read 39 times)

Zoey63294

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on: Jul 27, 2018
Whether the Universe is open, closed or flat depends, on the ___________ of the Universe.
 
  a. luminosity
  b. density
  c. temperature
  d. radius
  e. rotation rate

Question 2

Why can't lower-main-sequence stars become giant stars?
 
  What will be an ideal response?


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LegendaryAnswers

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

b

Answer to Question 2

Stars between 0.08 and about 0.4 solar mass, the red dwarfs, are mixed by convection, and so can't develop inert helium cores surrounded by unprocessed hydrogen. For this reason a red dwarf can never ignite a hydrogen shell and can't become a giant star.


Zoey63294

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

okolip

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Reply 3 on: Yesterday
Excellent

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