What is the chief difficulty in attempting to detect planets around other stars?
A)Even the largest planets are typically at least a factor of 10 times smaller than their host stars.
B)Planets do not emit visible light. They are typically at least a billion times fainter than their host stars.
C)Planets do not glow in the infrared, so infrared telescopes cannot be used to study them, either.
D)A and B
E)A, B, and C

Question

Quizplus · Accepted Answer

The chief difficulties in detecting planets around other stars include their small size relative to their host stars and the fact that they do not emit visible light, making them much fainter than their host stars. Planets can indeed emit or reflect infrared light, which is why option C is incorrect, leaving options A and B as the correct challenges.

What Is the Chief Difficulty in Attempting to Detect Planets