Process of Science: What would you say to a friend who thinks ...

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Process of Science: What would you say to a friend who thinks that the general theory of relativity is a beautiful example of abstract thinking by humankind that explains extreme phenomena in astrophysics but has no application to everyday life?
 
  What will be an ideal response?

Question 2

The Local Group is an example of a
 
  A) galaxy cluster
  B) galaxy
  C) supercluster
  D) planetary system

[wtf444]

Answer to Question 1

The map application in your smartphone would not work nearly as accurately as it does if general relativity was not used to calculate the orbits of the GPS satellites around the Earth.

Answer to Question 2

D

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TYSM

[shewald78]

Thanks for the timely response, appreciate it