21st Century Science and Technology Museum

Author: Zhou Chuanlin / Country: Mainland China
Publisher:
Publish Date: 2005-10-01
Features: Time and space exist around us. We grow up from childhood, proving the existence of time, and the world we live in proves the existence of space. People generally use years, months, days, hours, minutes, and seconds to measure the length of time, and kilometers, meters, decimeters, and centimeters to measure the distance of space. Nothing in the world can move without the concepts of time and space; they are interconnected and inseparable. People define one orbit of the Earth around the Sun as a year and one rotation of the Earth as a day, further dividing a day into 24 hours. As the saying goes, "An inch of time is worth an inch of gold, but an inch of gold cannot buy an inch of time," showing how important time is to us. In fact, humans have been studying time for a very long time, but they could only calculate it by counting days and nights. With the invention of timekeeping devices and the development of the cosmic view, time was gradually fixed with precise units. Today, we can use electronic clocks to accurately indicate time. Einstein was a great scientist, and his theory of relativity is a theory about the relationship between the motion of matter and the relationship between time and space. It is the theoretical foundation of modern physics. According to this theory, time and space are inseparable and can only be integrated into a unified entity called "spacetime." The space around us is three-dimensional space, simply put, a three-dimensional space composed of length, width, and height. If an additional time axis is added to this basis, it becomes the four-dimensional space imagined by humans. P48-49