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Author Question: Relate the age of the universe to the Hubble constant. What will be an ideal ... (Read 115 times)

james9437

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on: Jul 27, 2018
Relate the age of the universe to the Hubble constant.
 
  What will be an ideal response?

Question 2

What advantage do radio astronomers have over optical ones in mapping the entire Milky Way?
 
  What will be an ideal response?


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Bigfoot1984

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

Inverting the Hubble constant and putting all distances in kilometers, gives us the age of the universe in seconds, assuming that Ho has never changed.

Answer to Question 2

Dust clouds block our view of all but the nearest spiral arms, but 21-cm radio waves can map the hydrogen gas in spiral arms all around the galaxy.


james9437

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Reply #2 on: Jul 27, 2018
Thanks


Bigfoot1984

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Reply #3 on: Jul 27, 2018
Welcome :)


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