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Author Question: The density of the Universe is a. equal to the critical density if the Universe is closed. b. ... (Read 132 times)

olgavictoria

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on: Jul 27, 2018
The density of the Universe is
 
  a. equal to the critical density if the Universe is closed.
  b. equal to the critical density if the Universe is flat.
  c. greater than the critical density if the Universe is flat.
  d. greater than the critical density if the Universe is open.
  e. None of the other choices are correct.

Question 2

If white dwarfs have exhausted their fuel, why are they hot?
 
  What will be an ideal response?


kalskdjl1212

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

b

Answer to Question 2

When a star collapses into a white dwarf, it converts gravitational energy into thermal energy. Its interior becomes very hot.


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olgavictoria

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Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


kalskdjl1212

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Reply #3 on: Jul 27, 2018
Great! Please up vote :D


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