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The Milky Way is a spiral galaxy where the solar system is located. It is oval and has a huge disk structure. The latest research shows that the Milky Way has four clear and symmetrical spiral arms, which are 4,500 light years apart. The number of stars in the Milky Way is about 654.38+00 billion to 400 billion.

The galaxy as a whole rotates badly. The rotation speed at the sun is about 220 km/s, and the sun rotates around the center of the Milky Way for about 250 million years. The absolute visual magnitude of the Milky Way is -20.5, and the total mass of the Milky Way is about10.5 trillion times that of the sun. The age of the Milky Way is about 65.438+0 billion years, and the scientific community believes that the Big Bang occurred about 65.438+0.38 billion years ago. The Milky Way has two companion galaxies: large magellanic cloud and small magellanic cloud. They are all members of this galaxy cluster and part of virgo supercluster. It is part of the Raniacaya supercluster.

The Milky Way consists of silver core, silver core, silver disk, silver halo and silver crown from the inside out. Most of the central regions of the Milky Way are old stars (mainly white dwarfs), and most of the peripheral regions are new young stars. There are more than a dozen satellite galaxies around hundreds of thousands of light years, and the Milky Way keeps growing by slowly devouring dwarf galaxies around it.

The Milky Way passes through 25 constellations: Cygnus, Eagle, Fox, Sagittarius, Ophiuchus, Shields, Sagittarius, Scorpio, Temple of Heaven, Rectangular Ruler, Wolf, Southern Triangle, Compass, Fly, Southern Cross, Vela, Tail, Unicorn, Orion, Taurus and so on.

The Milky Way has different shades and widths in the sky. The narrowest is only 4 ~ 5, and the widest is about 30. However, the individual stars visible to the naked eye everywhere in the sky are all part of the Milky Way. The light emitted by this banded arc comes from the accumulated light of stars and other celestial bodies on the galactic plane that cannot be distinguished by the naked eye. For the northern hemisphere, it is an important symbol of the summer starry sky in the Milky Way, and it is a "summer triangle" composed of Vega, Altair on both sides of the Milky Way and three bright stars in Tianjin in the Milky Way. In summer, the Milky Way stretches from the east to the north of Scorpio and crosses the sky. Magnificent, magnificent. But it can only be seen in the wild without light interference (the limit of apparent magnitude is above 5. 1). In winter, the Milky Way is very dark (in Orion and Canis major), but in the sky, you can see the bright Orion and the bright "winter triangle" composed of Sirius, Betelgeuse and Nanhe. (Note: This paragraph is viewed from the northern hemisphere. )