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Author Question: Why would a value of 500 km/s/Mpc for the Hubble constant contradict theories of stellar evolution? ... (Read 54 times)

jho37

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on: Jul 27, 2018
Why would a value of 500 km/s/Mpc for the Hubble constant contradict theories of stellar evolution?
 
  What will be an ideal response?

Question 2

How might we tell whether the Universe is open or closed?
 
  What will be an ideal response?


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jazzlynnnnn

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

The Hubble time for this value is 2 billion years. Astronomers know of globular star clusters that are significantly older than 9.5 billion years.

Answer to Question 2

According to general relativity, the overall curvature of space-time is determined by the average density of matter plus energy in the Universe. Cosmologists could calculate that space-time is flat if the average density of the Universe equals a critical density. If the average density of the Universe is more than the critical density, the Universe must be closed; and if it is less, the Universe must be open.


jho37

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Reply 2 on: Jul 27, 2018
Great answer, keep it coming :)

Sarahjh

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Reply 3 on: Yesterday
Wow, this really help

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