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Author Question: Special relativity says that time is a separate ________ in the workings of the universe. Fill in ... (Read 51 times)

jerry coleman

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on: Jul 27, 2018
Special relativity says that time is a separate ________ in the workings of the universe.
 
  Fill in the blank(s) with correct word

Question 2

What do we mean by the critical density of the universe?
 
  What will be an ideal response?


atrochim

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

dimension

Answer to Question 2

In the absence of any mysterious repulsive force (or dark energy), a universe with the average mass density exactly equal to the critical density is the densest universe that will expand forever. A denser universe will eventually reverse its expansion and contract; a less dense universe will expand forever.


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