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Cygnus OB2 #12 is an extremely luminous blue hypergiant with an absolute bolometric magnitude (all electromagnetic radiation) of −10.9, among the most luminous stars known in the galaxy. This makes the star nearly two million times more luminous than the Sun, although estimates were even higher when the star was first discovered.
In astronomy, a blue giant is a hot star with a luminosity class of III or II (bright giant). In the standard Hertzsprung–Russell diagram , these stars lie above and to the right of the main sequence .
Blue Star was founded in 1943 by Mohan T Advani as a reconditioning company. [4] [5] Soon after inception, Blue Star ventured into the manufacturing of ice candy machines and bottle coolers and began the design, execution of central air conditioning projects, followed by the manufacturing of water coolers.
Notable examples of hypergiants include the Pistol Star, a blue hypergiant located close to the Galactic Center and one of the most luminous stars known; Rho Cassiopeiae, a yellow hypergiant that is one of the brightest to the naked eye; and Mu Cephei (Herschel's "Garnet Star"), one of the largest and brightest stars known.
HD 140283 (also known as the Methuselah star) is a metal-poor subgiant star about 200 light years away from the Earth in the constellation Libra, near the boundary with Ophiuchus in the Milky Way Galaxy. Its apparent magnitude is 7.205, so it can be seen with binoculars. It is one of the oldest stars known.
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2. The Blue Jays will trade Vladimir Guerrero Jr. and/or Bo Bichette. At one point, the Blue Jays were a young, hungry team looking like they were next up to dominate the American League.
The 2006 Blue Star Hurling match was also won by Dublin, the game finished on a scoreline of 2–19 to 0–10. [2] Both 2007 Blue Stars games finished level at full-time and both games were forced into penalties and the Blue Stars won on both occasions. [3] [4]