The beautiful and vast Milky Way in the night sky has aroused countless imaginations and endless explorations since ancient times. Our Milky Way is an ordinary disk galaxy among countless island universes, integrating hundreds of billions of stars over the past ten billion years.

The Milky Way is the star system where the solar system is located, including 150 to 400 billion stars and a large number of star clusters, nebulae, various types of interstellar gas and dust, and black holes. Its total visible mass is 210 billion times that of the Sun.

The Milky Way is a huge celestial system composed of numerous star clusters and nebulae, as well as hundreds of billions of stars. The bulk of the Milky Way's matter is made up of a thin disk called the Galactic Disk. The approximately spherical part of the bulge in the centre of the disk is called the nuclear bulb.

In the bulge region, the stars are highly dense, and there is a small dense area in the centre called the silver core. Outside the silver disk is a system with a larger range and approximately spherical distribution, in which the density of matter is much lower than that in the centre of the silver disk, called the halo.

There is also a silver crown outside the silver halo. The distribution of stars in the galactic disk is less dense, and the closer to the edge, the more sparse.

These stars are mainly distributed in the galactic halo and galactic disk of the Milky Way. Among them, the silver disk includes a geometrically thicker thick disk and a relatively thinner and more elongated thin disk.

However, the formation of the halo and disk of the Milky Way, and how they evolved into today's colourful Milky Way, are still scientific mysteries that astronomers urgently need to solve. These are also the main scientific targets of large-scale astronomical survey observation programs of many ground and space telescopes around the world.

The light emitted by the stars in the Milky Way is far away from Earth, and the amount of this light is immense. They are mixed with interstellar dust material, and the main part is projected just over the northern hemisphere of the Earth, forming a bright band. This bright band looks like a river of smog. Therefore, the Milky Way is not a river flowing in the sky, but a band of light in the night sky.

In addition to light belts, there are numerous celestial objects and landscapes in the Milky Way, such as nebulae, interstellar dust, planets, moons, comets, and stars, among others. These celestial bodies have their unique characteristics and phenomena, which attract astronomers to study and explore.

A nebula is a cloud-like object composed of gas and dust, usually formed by material ejected from a star. There are different types of nebulae, some of which are huge nebula complexes, while others are small, dense planetary nebulae. Some nebulae may also contain newborn stars.

The Milky Way is also a very active celestial system, including various astronomical phenomena such as star formation, supernova explosions, and planetary system formation. The study of these phenomena is crucial in understanding the evolutionary history and future development trends of the Milky Way.

The Milky Way is an extremely complex and diverse celestial system, which is of great significance for exploring the universe and understanding the evolutionary process of the universe.

With the continuous improvement of astronomical technology in the future, we believe that more and more mysteries will be revealed, allowing us to gain a deeper understanding of this grand and mysterious celestial system.