Interstellar matter obscures Earth's view of the disk of the Milky Way Galaxy
A) most at radio wavelengths, where hydrogen absorbs radio waves efficiently, and least at optical wavelengths.
B) more at optical wavelengths and less or not at all at infrared and radio wavelengths.
C) very little at any wavelength.
D) more or less equally at all wavelengths, from radio waves to light waves.

Question

Quizplus · Accepted Answer

Interstellar matter, including dust and gas, obscures Earth's view of the Milky Way Galaxy more at optical wavelengths because dust scatters and absorbs visible light. At infrared and radio wavelengths, the interstellar matter is less or not at all obstructive, allowing astronomers to observe regions of the galaxy that are otherwise hidden in visible light.

Interstellar Matter Obscures Earth's View of the Disk of the Milky