Molecular clouds, which have temperatures of around 10 K, are best observed at ________ wavelengths.
A) X-ray
B) ultraviolet
C) optical
D) infrared
E) radio

Question

Quizplus · Accepted Answer

Molecular clouds are cold and emit most of their radiation at longer wavelengths, such as radio, which is suitable for observing the cold, dense regions where molecules like CO are abundant.

Molecular Clouds, Which Have Temperatures of Around 10 K, Are