In The Morgan-Keenan Stellar Classification System That Uses Letters To Group Stars By Surface Temperature, What Letter Is Used For The Hottest Type Of Stars? They Are The Rarest Class Of Star And Have Surface Temperatures In Excess Of 30,000 K.

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1. In The Morgan-Keenan Stellar Classification System That Uses Letters To Group Stars By Surface Temperature, What Letter Is Used For The Hottest Type Of Stars? They Are The Rarest Class Of Star And Have Surface Temperatures In Excess Of 30,000 K.