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Apparent Magnitude Scale

Description
(b) Astronomers denote the brightnesses of objects in the sky by their apparent magnitudes. Stars visible to the naked eye
have magnitudes between m = –1.44 (Sirius) and about m = +6.0. However, CCD (charge-coupled device) photography
through the Hubble Space Telescope or a large Earth-based telescope can reveal stars and other objects nearly as faint
as magnitude m = +30. (a: Okiro Fujii, L’Astronomie)
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