The Greeks thought the constellation Canis Major looked like a
big dog so that's what they named it (Canis Major is Greek for "Big
Dog.").
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Canis Major is a constilation. Cy canis majoris is a star.
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Canis major is one Orion's hunting dogs Canis major contains the
star Sirius in it which is the brightest star in the sky Canis
major comes along with Canis minor