Interstellar Matter Obscures Our View of the Disk of the Milky

question 13

Multiple Choice

Interstellar matter obscures our 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.

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