People look at the stars and tend to believe that they are eternal and unchanged. Nevertheless, each star follows its life path and our universe is full of vestiges of stellar evolution; It is therefore important to understand the stages of stellar evolution and its vestiges, as well as the method of detection. The star formation process starts from the massive cosmic dust cloud formed by the compression gas of the giant molecular cloud and the result of the formation is called the protostar. The size of the protostar is probably larger than that of a solar system. It is the place where stars begin to form at extremely low temperatures and gravity is the main driving force that leads to star formation. Gravity presses the dust cloud into the sphere where pressure and heat begin to increase inside the sphere. This process is known as gravity compaction. During the process, the core temperature of this sphere will increase up 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 full of nuclear fusion thermal pressure and inward gravitational pressure will begin to produce energy and eventually become a source of light, heat and stellar wind and the result of this training is a star. After the star forms, the size and lightness of the star will remain constant for a long time. Stars from this period are called main sequence stars. Additionally, the lifespan of each star depends on its mass, while chemical composition and other secondary factors are also important. Low-mass stars are expected to have longer lifespans than high-mass stars, and the...... middle of paper ......s or targeting the Spiral Galaxy which has many young stars and waits for a supernova to appear. Such a method allows astronomers to observe many supernovas and record the brightness and variations after their explosion. Additionally, they also use a massive telescope to perform spectroscopic observations. So astronomers generalize this information and try to classify each supernova and try to understand why the supernova has such a violent explosion and thus we understand supernova remnants better. Supernova remnants have extremely important research value. This is likely the origin of the Milky Way's mysterious ultra-high energy cosmic rays. It is often a high-mass nebula and has close physical relationships with pulsars and neutral stars. At the same time, it is an essential astronomical object for studying the Milky Way..