If we could observe the Milky Way from outside it, we would see the bulky center, yellow and bright, shaped like a rugby ball, and a thin bluish disc spinning around.
Our galaxy has a spiral barred shape, like a grinder. In the center of our galaxy there is a black hole, which scientists call Sagittarius A. The center is not round, but rather elongated. Near him are the oldest stars, red and yellow.
Four arms are born from the center: Arm of Perseus, Arm of Orion, Arm of Sagittarius and Arm of Cruz Centauro. They form a disc that slowly spirals. In the arms are the youngest stars, white and blue. There are also many nebulae; in most of them new stars are formed. The Sagittarius Arm is the brightest of all.
The Milky Way is a large galaxy. It measures 100,000 light years in diameter and contains more than 200,000 million stars. Its gravity is so powerful, that it attracts other smaller nearby galaxies.
The Earth is 25,800 light years from the center of the galaxy, in a sparsely populated area of the Orion Arm. Our Solar system It takes 225 million years to complete the Milky Way.
Why is it called Milky Way?
At night, the Milky Way looks like a white strip that crosses the entire sky. In Latin, Milky Way means milk road. According to Greek mythology, the god Zeus had a son with a mortal. When Hera, his wife, found out, he ripped the baby from his mother's arms while breastfeeding him. The milk spilled and fell through the sky.
The Milky Way is also called the Camino de Santiago, as it used to guide pilgrims who went to Santiago de Compostela. Compostela means field or path of the star.
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