Opacity refers to the measure of how much light is absorbed or scattered by a medium, such as dust or gas, preventing it from passing through. In astrochemistry, opacity plays a crucial role in determining how light interacts with various materials in space, affecting the visibility and temperature of celestial objects. This concept is particularly important in understanding how dust grains can obscure light from stars and other astronomical phenomena, as well as in analyzing the composition and behavior of stellar atmospheres.
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