How does the milky way | Earth, Solar System and Universe.

If we could see the milky way from outside of it, we would see Centre bulky, yellow and bright, with rugby ball shape, and a thin disc of bluish turning around.
The milky way is spiral shaped barrada, as a grinder. In the Center there is a black hole, which scientists call Sagittarius A. The Center is not round, but somewhat elongated. Near it are old, red, and yellow stars.
The Center give birth to four arms: Perseus arm, arm of Orion, Sagittarius arm and arm cross Centaur. They form a disc that rotates slowly spiral. On the arms are younger stars, white and blue. There are also many nebulae; in most of these new stars are formed. The Sagittarius arm is the brightest of all.
The milky way is a large galaxy. Measure diameter light 100,000 years and contains more than 200 billion stars. Their gravity is so powerful, that attracts other smaller nearby galaxies.
Earth is 25,000 light-years from the center of the Galaxy, in an area that is sparsely populated in the Orion arm. Our Solar system takes 225 million years on a full ride to the milky way.

Why is it called milky way?

At night, the milky way looks like a white stripe that crosses the sky. In latin, Milky means milk road. According to Greek mythology, the god Zeus had a son with a mortal. When Hera, his wife, learned, ripped the baby from his mother's arms while you feeding it. The milk was spilled and fell through the sky.
Also called the Milky the Camino de Santiago, as formerly it served as a guide to the pilgrims going to Santiago de Compostela. Compostela means field or road star.
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