Plural of coma; a state of deep unconsciousness, or in astronomy, the cloudy outer region of a comet surrounding the nucleus.
From Latin 'coma' (deep sleep or hair), derived from Greek 'kome' (hair). The plural form applies equally to medical unconsciousness or astronomical comet halos.
When a comet approaches the sun, the 'comae' can grow to be bigger than the entire sun itself—billions of kilometers across—even though it's mostly just dust and gas!
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