The Basics of Astronomy

The basics of astronomy include:

1. Stars: stars are the most basic, important and widespread objects in the universe. The process of creation, evolution and death of stars is one of the focuses of astronomy.

2. Galaxies: Galaxies are huge celestial systems composed of stars, nebulae, gas and dust. Studying the composition and evolution of galaxies can help us understand the formation and evolution of the universe.

3. Big Bang Model: The Big Bang model is a theory that explains the origin and evolution of the universe, which is believed to have been formed by a big bang 1.38 billion years ago. This theory is widely recognized and supported by a large number of observations and studies.

4. Black holes: Black holes are an extremely complex object in the universe with extremely strong gravity and energy. The theory and study of black holes play an important role in understanding the structure and evolution of the universe.

5. Planets and Satellites: Planets and satellites are celestial bodies in the solar system, and the Earth we live on is one of the planets. The origin and evolution of the Earth can be better understood by studying the nature, composition and evolution of planets and moons.