Why are the stars Betelgeuse and Rigel also known as alpha and beta Orionis?

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    They are two stars in Orion that are very close together and so need to be distinguished by letter designations.
     They are the two stars in the constellation Orion that are closest to Earth.
     They are two stars that are close to, but not quite within, the constellation Orion.
     They are very young stars in the constellation Orion that are not quite fully developed.
     They are the two brightest stars in the constellation Orion.
asked Sep 20, 2012 in Astronomy by anonymous
    

1 Answer

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They are the two brightest stars in the constellation Orion.
answered Sep 22, 2012 by SkyStar ~Expert~ (2,855 points)

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