The present significance of Vega

Vega is in the east of the Milky Way, and its western name is Vega. In the past, people in China divided the sky into two or eight places and three places. Now astronomers all over the world have decided to divide the sky into 88 "constellations". Vega is the brightest star in Lyra. There are five stars in the nearby galaxy that are almost as bright as a cross. These five stars belong to cygnus. There are three stars in the west of the Milky Way. The brighter star in the middle is Altair, also called Altair. In ancient China, they were called Hegu, Hegu and Huanggu, while in the west they were called Altair. Cowherd is the brightest star in Aquila. It and the two stars with smaller brightness on both sides are sometimes called "shoulder pole stars". According to the myth, the two stars next to them are Cowherd and his children. Swan is floating in the Milky Way, a girl is weaving by the river, and a shepherd with two children is herding cattle on the other side. What a beautiful picture this is. Cowherd and Weaver Girl are much bigger and brighter than the sun. Why do we just look like two small lights? That's because these two stars are much farther away than the sun. The brightness of the cowherd is 10.5 times that of the sun, its diameter is 70% larger, and its mass is almost 70% larger. Weaver Girl's luminosity is 60 times that of the sun, its diameter is 2.76 times that of the sun, and its mass is almost 3 times that of the sun. So the weaver girl is bigger, brighter and heavier than the cowherd, and she is also the elder sister of the cowherd. The cowherd is 154 trillion kilometers away from us, which is 1 10,000 times farther than the sun. The distance of the Weaver Girl from us is 250 trillion kilometers, which is 1.7 million times farther than the sun. The weaver girl is not only bigger and brighter than the cowherd, but also far away, so we look almost as bright as the two stars. It takes 16 4 months for light to reach our eyes from Altair. It takes 26 years and 5 months for light to shine from Vega. Cowherd and Weaver Girl are not in the same direction, and the distance between them is 16.4 light years. Radio waves travel at the same speed as light. If the Cowherd wants to make a wireless call to the Weaver Girl, it will take 32 years to receive a call back.