Constellations Aquila shines on the front wings through the glowing band of the Milky Way. Look at it high in the south in late summer.Aquila, EagleAquila's brightest star is Altair, the "eagle", a white star about 17 light years from Earth. Altair is the southernmost point of the pattern of three bright stars known as the Summer Triangle. (Deneb, in the planetarium Cygnus, forms the northeastern point of the triangle. Vega is in Lyra, northwest. Altair is nice and bright and easy to find right until the beginning of winter.)Altair is nearly twice that of the Sun, so it would only equal 10 billion of the Sun versus two billion years. Despite its size, Altair appears to turn its axis once every 10 hours, compared to about four weeks for the Sun. One of the effects of Altair's high-speed rotation is that its gas moves outward from the equator, making the star appear flattened - it is about 14 percent wider through the equator than the poles. If Altair rotates a...
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