Here are some key points to consider:

• The mass hierarchy problem refers to the lack of knowledge about the masses of neutrinos.
• Neutrinos are created in the cores of stars and in nuclear reactors, and they interact with matter through the weak nuclear force.
• The masses of neutrinos determine how they interact with matter, which in turn affects the way that stars form and evolve.
• The mass hierarchy problem has significant implications for our understanding of the fundamental laws of physics.
• The JUNO experiment is a cutting-edge neutrino detector that is designed to solve the mass hierarchy problem.
• The detector uses a innovative design to detect neutrinos, which involves using a large, spherical detector that is filled with liquid scintillator.
• The experiment is expected to provide a wealth of new information about the masses of neutrinos and is a significant step forward in the study of neutrinos and their properties.