Why do astronomers narrow their search to the habitable zone of ...

[jlmhmf]

Why do astronomers narrow their search to the habitable zone of other star systems?
 
  a. the most likely place to support planets with thick atmospheres
 b. the least likely place to have zero ultraviolet radiation
 c. the most likely place with liquid water, and extraterrestrial life
 d. the most likely place to have oxygen in the atmosphere
 e. the least likely place to have wide temperature ranges on the surfaces of planets

Question 2

What is the name for the radio frequency window astronomers use to search for extraterrestrial communication?
 
  a. Drake window
  b. Phoenix waves
  c. SETI window
 d. water hole
 e. OH hole

[Kedrick2014]

Answer to Question 1

c

Answer to Question 2

d

[jlmhmf]

Thanks for the timely response, appreciate it

[amit]

Gracias!