The Milky Way consists of silver core, silver core, silver disk, silver halo and silver crown from the inside out. There are more than a dozen satellite galaxies around hundreds of thousands of light years, and the Milky Way keeps growing by slowly devouring the surrounding dwarf galaxies. The silver disk is the main part of the Milky Way, which is a flat disk composed of stars, dust and gas. 90% of the detectable substances in the Milky Way are within the scope of the silver disk. The shape of the silver disk is like a thin lens, which is distributed around the silver center in the form of axial symmetry. The core of the Milky Way, namely the silver core or the silver core, is a very special place. It emits intense radio radiation, infrared radiation, x-ray radiation and? Ray radiation.

Physically speaking, the Milky Way includes100 billion to 400 billion stars, a large number of star clusters, nebulae and various types of interstellar gas and dust. Seen from the earth, the Milky Way is a silvery white ring around the sky. 90% of the matter in the Milky Way is stars. The total mass of the Milky Way is about 654.38+0 trillion times that of the sun, and the solar system revolves once every 200 million to 250 million years, which can be called a galactic year. So according to the age of the sun, the sun has circled the Milky Way 654.38+09-25 times. Scientists at Columbia University have accurately calculated the mass of the Milky Way. The latest results show that the mass of the Milky Way is about 210 billion times that of the sun, including clusters of thousands of stars on the edge of the Milky Way. Scientists got the mass distribution map of the Milky Way after running the supercomputer, and the calculated mass of the Milky Way is the most accurate.

The solar system contains many small galaxies, so which family is the smallest small galaxy? It's hard to find small galaxies. However, a small star is a different field, because it is a combination of dark matter, so it is completely different from ordinary galaxies. It is the Segregal 2 galaxy, which should be the smallest galaxy discovered so far. Galaxy? Segrega 2? It is only 200 times brighter than the sun and 900 times bigger than the solar system.