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PurpleSkyz

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Published on Jul 5, 2018


During the late evening hours, search for the famous "Summer Triangle" high in the eastern sky. The triangle consists of three of the brightest stars in the sky, each the brightest star in its own constellation. The brightest is the bluish-white star Vega, in Lyra, the lyre. Next in brightness is yellow-white Altair in Aquila, the eagle. Finally there is white Deneb, in Cygnus, the swan. From our viewpoint, Vega appears twice as bright as Altair and more than three times brighter than Deneb. But sometimes things are not always what they seem. We know that Vega clearly is more luminous compared to Altair, because it’s situated at a greater distance from us. Altair is 17 light years away, while Vega is just a little farther out at 25 light years away. The light you're seeing from Altair tonight started on its journey to Earth in 1996, and the light from Vega started on its way toward Earth back in 1988. But brilliant Vega actually pales in comparison with Deneb, one of the greatest supergiant stars known. Deneb's distance measures 1,467 light-years from Earth with a luminosity computed to be more than 60,000 times that of the sun. Because its light takes nearly 15 centuries to reach us, Deneb merely appears as a fairly conspicuous but by no means particularly notable star. http://earthsky.org/tonight/summer-tr... https://www.space.com/21864-summer-tr... Clips, images credit: Hubblesite, NASA/JPL, ESO, ESA Music credit: YouTube Audio Library



  

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