If the value of H has not changed since the Big Bang, then H = 70 ...

[Bob-Dole]

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]

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.

[Bob-Dole]

Thank you!

[micaelaswann]

Always glad to help...