Regarding the mass collected on an individual's head, what is the effect of purely extraterrestrial sources?

Answer

The mass contribution is minuscule and cannot alter weight or health measurably

The amount of mass contributed by purely extraterrestrial sources settling on a single person's head is minuscule when considered on a human scale and is insufficient to alter weight or health.

Regarding the mass collected on an individual's head, what is the effect of purely extraterrestrial sources?
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