Question

it is most difficult to study star formation at visible wavelengths. infrared wavelengths. radio wavelengths. select the reason why studying star formation at these wavelengths is the most difficult. earths atmosphere blocks much of this radiation. the process of star formation does not result in much of this type of radiation. stars form in dusty regions that are opaque to these wavelengths. radiation is redshifted to longer wavelengths by the dusty clouds that stars form within.

Explanation:

Stars form in dense, dusty molecular clouds. These dust - filled regions are opaque to visible light, blocking our view of the star - formation processes occurring within. Infrared and radio wavelengths can penetrate these dusty regions better than visible light. Earth's atmosphere can be dealt with using space - based observatories for infrared and radio. Redshift is not the main reason for difficulty at visible wavelengths. The star - formation process does emit radiation across wavelengths, but visible light is blocked by dust.

Answer:

First part: visible wavelengths
Second part: Stars form in dusty regions that are opaque to these wavelengths.