In the boundless universe, the stars shone with mysterious light, and the planets orbited the sun to compose the magnificent chapters of the universe.

As a science for human beings to explore the mysteries of the universe, astronomy not only helps us understand the origin, evolution, and structure of the universe but also shows us the infinitely vast universe.

In this field of science, there are countless amazing facts and discoveries hidden. The following will present you with some famous and interesting pieces of astronomy knowledge, let us embark on a journey of exploring the stars together.

1. Black hole singularity: A black hole is a region of space with an extremely strong gravitational force. Its core is called a singularity, where the gravitational force is infinite, and not even light can escape.

2. The history of constellations: Many constellations have their names derived from ancient Greek mythology, such as the story of Ursa Major and Ursa Minor with the North Star, and the legend of the pearl necklace in Perseus.

3. Light-year concept: A light-year is a unit of distance, indicating the distance that light travels at a speed of about 299,792,458 meters per second within one year. It is used to measure enormous distances in the universe.

4. Structure of the Milky Way: Our solar system is located in a giant galaxy called the Milky Way. The Milky Way has a flat disk-like structure with a huge star cluster at the center, known as the galactic center or galactic core.

5. Trajectories of comets: Comets are celestial bodies made of ice and dust that orbit the sun. When a comet is close to the sun, the sun's radiation will cause a beautiful tail on the surface of the comet.

6. Supernova explosion: A supernova is a phenomenon in which stars explode after running out of nuclear fuel. The energy and brightness they produce can exceed the total energy of the entire galaxy for a short period of time.

7. The rotation and revolution of the earth: The rotation of the earth means that the earth rotates around its own axis, and a day is divided into 24 hours. The revolution of the earth refers to the movement of the earth around the sun in one year.

8. Contributions of Nicolas Copernicus: Nicolas Copernicus proposed an alternative to the geocentric theory, the heliocentric theory, which showed that the planets orbit the sun, which had a profound impact on the development of astronomy.

9. The Hubble Discovery: The Hubble Space Telescope was sent into space and is unaffected by the atmosphere, allowing scientists to obtain clearer and more precise images of the universe.

10. Cosmic microwave background radiation: The cosmic microwave background radiation is the residual heat from the early Big Bang of the universe. It is considered to be one of the important pieces of evidence for the Big Bang theory, and it also provides us with a window to study the early universe.

11. The tidal locking of the moon: One side of the moon always faces the earth, which means that its rotation period is equal to the revolution period so we can only see one side of the moon.

12. Counterclockwise rotation of Venus: Unlike most planets, Venus rotates counterclockwise, causing the sun to rise in the west and set in the east.

13. Olympus Volcano on Mars: Olympus Volcano on Mars is the tallest volcano in the solar system, higher than Mount Everest on Earth, and its diameter exceeds 600 kilometers.

14. Europa's frozen ocean: Jupiter's moon Europa is considered to have an ice-covered ocean with a depth of tens to hundreds of kilometers under its surface, which may have the conditions for the existence of life.

15. The periodic appearance of Halley's Comet: Halley's Comet is a comet with a periodic orbit, returning about once every 76 years, and its trajectory has been extensively studied.

16. Binary star system: Many stars do not exist in isolation, but in pairs or multiple galaxies, which move around a common center of mass.

17. Uranus's tilting rotation: Uranus's rotation axis is almost parallel to its orbit, making it extremely tilted, causing its north and south poles to receive long periods of sunlight at different times.

18. Planetary Nebulae: Planetary nebulae are beautiful structures formed when certain stars die that look like planets but are actually made of gas and dust ejected from the star.

19. Huge superclusters: Several superclusters contain more stars than the entire Milky Way galaxy, and these superclusters are often collections of young stars.

20. The expansion of the universe is accelerating: The discovery that the rate at which the universe is expanding is accelerating won a Nobel Prize in Physics, but the reasons behind it are still an active area of research.

This knowledge is just the tip of the iceberg in astronomy, the universe is so vast and mysterious, full of amazing facts and discoveries.