Question

question 17
astronomers record light from heavenly bodies with radar.
true
false
question 18
the instrument that can be used to map the surface of a planet is radar.
true
false
question 19
the type of telescope that is least affected by poor weather conditions is the maser.
true
false

Explanation:

For Question 17, astronomers record light from heavenly - bodies using telescopes, not radar. Radar works by sending out radio waves and detecting the reflections, not for recording light.
For Question 18, radar can be used to map the surface of a planet as it sends out radio waves and analyzes the reflected signals to create a map.
For Question 19, masers are not telescopes. Radio telescopes are less affected by poor weather conditions compared to optical telescopes, and masers are microwave - amplifying devices, not telescopes.

Answer:

Question 17: B. False
Question 18: A. True
Question 19: B. False