It could be raining water atoms instead of drops

One molecule of water is two Hydrogen atoms and one Oxygen atom. The two Hydrogen atoms are on the same side of the Oxygen atom which makes a water molecule polarized.  The side with the Hydrogen atoms is positively charged while the other side is negatively charged. This allows water molecules to bind together easily with the positive side of one water molecule lining up with the negative side of another water molecule. This polarization is what allows rain drops and clouds to form. Without the polarization the water molecules could not combine to form these water drops.

(The Great Courses – Origins of Life)

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