In the context of the interstellar medium, what does the term "ice" primarily refer to?

Answer

Frozen molecules clinging to microscopic dust grains

When discussing the interstellar medium, "ice" refers to thin coatings of frozen molecules, such as water, carbon monoxide, and methane, that cling to microscopic dust grains.

In the context of the interstellar medium, what does the term "ice" primarily refer to?
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