 Vega ( α Lyr , α Lyrae , Alpha Lyrae ) is the brightest star in the constellation Lyra , the fifth brightest star in the night sky and the second brightest star in the northern celestial hemisphere , after Arcturus . It is a relatively close star at only 25 light @-@ years from Earth , and , together with Arcturus and Sirius , is one of the nearest bright stars to the Sun .
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