Audio Guide：

As the evolution of high-mass stars comes to an end, nuclear fusion stops at the core. The outward pressure of high heat is no longer enough to resist the inward pressure of gravitational force. Eventually, a giant explosion occurs after a series of events, and a bright star appears in space. This is known as a supernova. However, low-mass stars do not go through the phase of supernova explosion. Instead, they eject gas in their atmosphere into the space to form a planetary nebula. The planet core that remains becomes a white dwarf. The level of mass in a star will determine its final fate. Stars whose mass is smaller than 8 Suns will become planetary nebulae and white dwarfs in the end. Stars that are 8 times larger than the solar mass will likely turn into a neutron star or black hole. High-density celestial objects such as white dwarfs, neutron stars, or black holes are known as compact stars.