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Author Question: If the value of H has not changed since the Big Bang, then H = 70 km/s/Mpc will give a Hubble Time ... (Read 16 times)

Bob-Dole

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on: Jul 27, 2018
If the value of H has not changed since the Big Bang, then H = 70 km/s/Mpc will give a Hubble Time of about 14 billion years.
 
  Indicate whether the statement is true or false

Question 2

Contrast the main mirrors of Newtonian and Cassegrain designs.
 
  What will be an ideal response?


micaelaswann

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

TRUE

Answer to Question 2

Both use a curved mirror, but the Newtonian has a flat secondary mirror that sends the light to an eyepiece at the side of the telescope, while the Cassegrain mirror is similar, but usually more steeply curved, and needs a hole to be drilled in the center for access to the Cassegrain focus behind this mirror.


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Bob-Dole

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Reply #2 on: Jul 27, 2018
Thank you!


micaelaswann

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Reply #3 on: Jul 27, 2018
Always glad to help...


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