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one Two Bears and a Dragon
two Ursa Major and Ursa Minor
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absolute magnitude ALPHA ancient Andromeda apparent magnitude Arabic astronomical units atoms BETA Betelgeuse blue-white bright brighter called Cassiopeia center of mass Cepheids Cepheus circumpolar clouds color companion components constellation core degrees northwest diameter discovered Earth eclipsing emission EPSILON faint stars fainter fourth-magnitude galactic GAMMA gaseous globular cluster Greek Hale Observatories heavens helium Herschel hydrogen interstellar ionized known lies light years distant luminosity luminous lying Lyrae main sequence main-sequence star massive miles per second million miles Mizar naked-eye nebula northeast novae object observed optical optical companion orbit Orion parallax parsecs period Perseus photographic planetary Polaris primary proper motion protostar RA 12 h radiation radio red dwarf red giant Rigel rotation shell small telescope solar southeast southern spectral class spectral lines spectral type spectroscopic binary spectrum star's stellar subgiant Sun's supergiant supernova temperature Ursa Major variable velocity visible white dwarf Zeta