Stellar classification
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"Stellar classification" is a title based upon conjecture.
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Stellar classification was used to assign classes to stars based on certain characteristics.
Human classification
The Tenth Doctor knew of and used the human-designed Harvard spectral classification. Accidentally arriving on the planet Sunday, the Doctor wondered why Arkon (his intended destination) had an orange star, instead of a hot, white class F star. This led him to believe that either the Arkonides had experimented with stellar manipulation, or that he was on the wrong planet. (PROSE: Wetworld)