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Magnitude was a number that defined the brightness of an astronomical object.

For an object such as a star, the amount of brightness emitted was reflected in the intensity of radiation produced. A star with a super-dense corona had a higher level of magnitude, which translated into the radiation being more intense. (TOS: "Balance of Terror"; TNG: "Suspicions")

In 2266, the comet Icarus IV was rated as magnitude seven by the sensors of the USS Enterprise. (TOS: "Balance of Terror")

In 2267, Gothos was rated as a a magnitude 1E planet by the sensors of the Enterprise. (TOS: "The Squire of Gothos")

In 2268, the primary of the Gamma 7A system was rated as a fourth magnitude sun. Information on this system was stored in the library computer of the Enterprise. (TOS: "The Immunity Syndrome")

A solar flare, ejected from the sun located at the center of a Dyson sphere discovered in 2368, was identified as a "magnitude 12, class B". (TNG: "Relics")

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