text: Betelgeuse (in Orion) is a red giant that is so large that its diameter is the size of the orbit of Jupiter i.e. about 10 AU acrooss (930,000,000 miles) and this is 650 Solar Diameters across.\n\nBut this is just a weedy titch compared to the biggest 3 which are\n\nVV Cephei 1900 Solar Diameters\nV354 Cephei 1520 Solar Diameters\nKW Sagitarii 1460 Solar Diameters\n\nThe brightest 3 by Absolute Magnitude (how bright they would look at a distance of 10 parsecs) are\n\n(Star, Magnitude, Luminosity compared to the Sun =1)\nLBV 1806-20 −14.2 40,000,000 \nThe Pistol Star   −13.2 16,000,000 \nCyg OB2-12   −12.2 6,300,000 \n\nThe heaviest stars: the top 3 are: \n\nEta Carinae 150 Solar Masses \nPistol Star 150 Solar Masses \nLBV 1806-20 130 Solar Masses \n\nStellar mass is the most important attribute of a star. Combined with chemical compostion, mass determines a star’s luminosity, its physical size, and its ultimate fate.\n\nAs to the strangest stars, Wiki comments on a couple of binary star systems in Auriga, the Charioteer:\n\nTwo peculiar binary stars, ε Aurigae and ζ Aurigae. ε Aurigae is one of the strangest binary stars. The orbital period is about 27 years, with an eclipse duration of about 18 months. The visible companion is a yellowish (F-class) supergiant. The type of the other star is not known. ζ Aurigae has a period of 970 days, the primary is a (K-class) supergiant and the secondary is a (B-class) main sequence star. Both these systems present a rare stage of binary evolution, as the components are in a short and active evolutionary stage.