Globular clusters can be used to estimate the distance to ...

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Globular clusters can be used to estimate the distance to galaxies by measuring the clusters' ____.
 
  a. angular diameter
 b. mass
 c. orbital speed
 d. age
 e. recession velocity

Question 2

Jenny, who lives on a farm in a rural part of New York, calls her cousin, Karen, in Brooklyn to tell her that she can see the Milky Way in tonight's night sky. However, Karen says she can't see it at all. What is preventing Karen from seeing the Milky Way in the night sky?
 
  a. Karen does not have a strong enough telescope.
  b. Karen lives in an area with light pollution.
 c. Karen isn't in the same hemisphere as Jenny.
  d. Karen needs to use a reflecting telescope.
 e. Karen isn't looking in the right direction.

[xiaomengxian]

Answer to Question 1

a

Answer to Question 2

b

[drink]

Thanks for the timely response, appreciate it

[phuda]

Excellent