How have complex molecules such as formaldehyde (H₂CO)been detected in interstellar clouds?

Question

Quizplus · Accepted Answer

Complex molecules such as formaldehyde have been detected in interstellar clouds by observing the molecular emission lines. When these molecules are excited by energy from nearby stars or other sources, they emit radiation at specific frequencies that can be detected with radio telescopes. This is a technique known as radio astronomy, and it allows us to study the chemical composition and physical conditions of interstellar clouds even though we cannot directly sample them with spacecraft.

How Have Complex Molecules Such as Formaldehyde (H₂CO)been Detected in Interstellar