探访宇宙英文演讲.docx

探访宇宙英文演讲 Teachers and students: hello everyone! My name is XXX. The theme of my speech today is exploring the boundless universe. Outside the earth where we live, there is a beautiful world. The world is called the universe. The universe is a boundless and endless world. No matter how advanced telescopes are used, our line of sight cannot reach the end of the universe; No matter how much we know, it is difficult to understand all the mysteries of the universe. Thousands of years ago, the Chinese nation had the word universe. In Wenzi nature, there is a saying that in the past, it was called the universe, and from the top to the bottom, it was called the universe. Therefore, Yu stands for all space, Zhou stands for all time, and the word universe means all time and space. In ancient times, people often made guesses about the universe through their own living environment. During the Western Zhou Dynasty, people living on the land of China put forward the theory of covering the sky in a round place. In the Eastern Han Dynasty, Zhang Heng put forward the muddy sky theory. At that time, huntian theory could not immediately replace Gaitian theory, and they argued endlessly with each other. It was not until some astronomers in the Tang Dynasty made accurate measurements that they completely denied the Gaitian theory. Since then, the huntian theory has dominated the field of astronomy in ancient China for thousands of years. In ancient China, there was also a cosmic conjecture called Xuanye theory. Although it is not very famous, it is the most insightful idea of infinite universe in Chinese history. It first appeared in the Warring States period, claiming that the universe is infinite, the universe is full of gas, and all celestial bodies float in the gas. The laws of motion of stars, sun and moon are determined by their respective characteristics. It is different from previous peoples ideas, breaking the theory of solid celestial sphere and creating the theory of celestia