What wavelength regime is most commonly used in searches for extraterrestrial intelligence?

Question

Quizplus · Accepted Answer

The most commonly used wavelength regime in searches for extraterrestrial intelligence is radio waves. This is because radio waves can easily penetrate through interstellar dust and gas, and are also emitted by many natural sources in the universe, making it easier to distinguish between natural and artificial signals. Visible, ultraviolet, and X-ray wavelengths are not commonly used in searches for extraterrestrial intelligence because they are easily absorbed by interstellar dust and gas, making it difficult for these signals to travel over long distances.

What Wavelength Regime Is Most Commonly Used in Searches for Extraterrestrial