As darkness falls on these balmy July evenings, the famous "Summer Triangle" is high in the eastern night sky. This seasonal triangle is composed of three of the brightest stars in the night sky, each of which is the brightest star in its own constellation. The brightest of the bunch is the bluish-white star Vega in Lyra, the Lyre. Next up is the yellow-white Altair in Aquila, the Eagle, with the white Deneb,in Cygnus, the Swan, rounding out the trio. Sometimes when I find myself outdoors and giving an impromptu talk on the night sky, I'll direct my audience's attention to the Summer Triangle. Then I'll ask two questions. First, what order of brightness are the three stars, from the...
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