What is proper motion? A) It is the true, not apparent, motion ...

[bcretired]

What is proper motion?
 
  A) It is the true, not apparent, motion of a star in space.
  B) It is the apparent shift as we go to opposite sides of our orbit every six months.
  C) It is the annual apparent motion of a star across the sky.
  D) It is the motion of a star towards or away from us, revealed by Doppler shifts.
  E) It is the orbital motion of a star around the Galaxy.

Question 2

How does Drake define a technological civilization?
 
  A) one that can get into space
  B) one that can communicate over interstellar distances
  C) one that has a written language
  D) one that can construct metal tools
  E) one that can have the intelligence not to destroy itself

[lou]

Answer to Question 1

C

Answer to Question 2

B

[bcretired]

Great answer, keep it coming

[flexer1n1]

Thanks for the timely response, appreciate it