People look at the stars and tend to believe that they are eternal and unchanging. However, each star follows its own life path, and our universe is full of remnants of stellar evolution; therefore it is important to understand the stages of stellar evolution and its remnants and also the method of detecting them. The star formation process begins from the massive cloud of cosmic dust formed by the compression gas of the giant molecular cloud, and the result of formation is called a protostar. The size of the protostar is likely to be larger than a solar system. It is the place where stars begin to form at extremely low temperatures and gravity is the main driving force leading to star formation. Gravity presses the dust cloud into the sphere where pressure and heat begin to increase inside the sphere and this process is known as gravity compaction. During the process, the internal temperature of this sphere will rise to 10 million degrees, and the thermal energy will force the hydrogen atoms to fuse into helium, and this process is called nuclear fusion. Once nuclear fusion begins, the sphere filled with nuclear fusion thermal pressure and internal gravitational pressure will begin to produce energy and will eventually become a source of light, heat and stellar wind and the result of this formation is the star. After star formation, the size and brightness of the star will remain constant for a long period. Stars in this period are called Main Sequence Stars. Furthermore, the lifespan of each star depends on its mass, while the chemical composition and other secondary factors are also significant. Low-mass stars are predicted to have longer lifetimes than high-mass stars, and the...... middle of paper ... or pointing to the Spiral Galaxy which has numerous young, supernova-expecting stars to appear . This method allows astronomers to observe many supernovae and record their brightness and variation after their explosion. Furthermore, they also use huge telescopes to conduct spectroscopic observations. Therefore, astronomers generalize this information and attempt to classify each supernova and try to understand why the supernova has such a ferocious explosion and thus we understand more about supernova remnants. Supernova remnants have extremely significant research value. It is probably the origin of the mysterious very high-energy cosmic rays in the Milky Way. It is often relevant to a high-mass nebula and has a close physical relationship with pulsars and neutral stars. At the same time it is an essential astronomical object for studying the Milky Way.