What is the primary interaction holding the molecular ice together on dust grains in star-forming clouds?

Answer

Van der Waals forces

In the near-vacuum of a star-forming cloud, the primary interaction holding the molecular ice together on dust grains is the much weaker Van der Waals forces, contrasting with the strong hydrogen bonds found in terrestrial water ice.

What is the primary interaction holding the molecular ice together on dust grains in star-forming clouds?
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